Gives plasmamen helmets maskless internals support (#75552)

## About The Pull Request
This allows plasmamen helmets to work for internals without needing
breathing masks, just like most EVA helmets, and removes the masks from
the plasmamen outfits that don't have a mask with unique features.

So Plasmamen still spawn with sechailers and clown masks with the plasma
filter, but medical masks are gone as they don't have any utility
outside of some disease protection interactions, which the helmet
already covers, I think... tell me if I'm dumb and I will revert this
one.

It was really silly that the species that is complete sealed from the
enviroment or they would burn to death had the "Your helmet is not
sealed!!!" error message when they tried to use their complete atmos
sealed helmet without a mask.

I assume this was mostly an oversight with the PR that added maskless
internal supports for helmets, EVA helmets all have it, even biosuits
do, but plasmamen were left out.

Maint approval for species change:
![thank you
John](https://github.com/tgstation/tgstation/assets/55374212/9784aec4-7092-451f-b682-ffc008d3a345)

## Why It's Good For The Game
This frees the mask slots of plasmamen that have been blocked forever,
we won't have plasmamen chefs depressed they don't get to enjoy their
moustache's accent, we also don't need to make plasmamen version of any
job specific mask in the future (Tho that never happens, they were
always left down...)

Pretty clear buff to Plasmamens as they can now be smokers, eat
bubblegum, run around with a toast in their mouth, but the fungus people
deserve to enjoy these "mostly" cute features without having to swap
helmets.

## Changelog

🆑 Guillaume Prata
balance: Plasmamen won't spawn with breathing masks anymore as their
helmet has maskless internals support now. Enjoy your moustache's accent
plasmacooks!
/🆑

code/modules/clothing/outfits/plasmaman.dm

@@ -4,7 +4,6 @@
 	uniform = /obj/item/clothing/under/plasmaman
 	gloves = /obj/item/clothing/gloves/color/plasmaman
 	head = /obj/item/clothing/head/helmet/space/plasmaman
-	mask = /obj/item/clothing/mask/breath
 	r_hand= /obj/item/tank/internals/plasmaman/belt/full
 	internals_slot = ITEM_SLOT_HANDS
 
@@ -44,7 +43,6 @@
 	uniform = /obj/item/clothing/under/plasmaman/medical
 	gloves = /obj/item/clothing/gloves/color/plasmaman/white
 	head = /obj/item/clothing/head/helmet/space/plasmaman/medical
-	mask = /obj/item/clothing/mask/breath/medical
 
 /datum/outfit/plasmaman/coroner
 	name = "Coroner Plasmaman"
@@ -52,7 +50,6 @@
 	uniform = /obj/item/clothing/under/plasmaman/coroner
 	gloves = /obj/item/clothing/gloves/color/plasmaman/black
 	head = /obj/item/clothing/head/helmet/space/plasmaman/coroner
-	mask = /obj/item/clothing/mask/breath/medical
 
 /datum/outfit/plasmaman/paramedic
 	name = "Paramedic Plasmaman"
@@ -60,7 +57,6 @@
 	uniform = /obj/item/clothing/under/plasmaman/paramedic
 	gloves = /obj/item/clothing/gloves/color/plasmaman/plasmanitrile
 	head = /obj/item/clothing/head/helmet/space/plasmaman/paramedic
-	mask = /obj/item/clothing/mask/breath/medical
 
 /datum/outfit/plasmaman/viro
 	name = "Virology Plasmaman"
@@ -68,7 +64,6 @@
 	uniform = /obj/item/clothing/under/plasmaman/viro
 	gloves = /obj/item/clothing/gloves/color/plasmaman/white
 	head = /obj/item/clothing/head/helmet/space/plasmaman/viro
-	mask = /obj/item/clothing/mask/breath/medical
 
 /datum/outfit/plasmaman/chemist
 	name = "Chemist Plasmaman"
@@ -76,7 +71,6 @@
 	uniform = /obj/item/clothing/under/plasmaman/chemist
 	gloves = /obj/item/clothing/gloves/color/plasmaman/white
 	head = /obj/item/clothing/head/helmet/space/plasmaman/chemist
-	mask = /obj/item/clothing/mask/breath/medical
 
 /datum/outfit/plasmaman/science
 	name = "Science Plasmaman"
@@ -228,7 +222,6 @@
 	uniform = /obj/item/clothing/under/plasmaman/chief_medical_officer
 	gloves = /obj/item/clothing/gloves/color/plasmaman/white
 	head = /obj/item/clothing/head/helmet/space/plasmaman/chief_medical_officer
-	mask = /obj/item/clothing/mask/breath/medical
 
 /datum/outfit/plasmaman/research_director
 	name = "Research Director Plasmaman"

code/modules/clothing/spacesuits/plasmamen.dm

@@ -44,7 +44,7 @@
 	desc = "A special containment helmet that allows plasma-based lifeforms to exist safely in an oxygenated environment. It is space-worthy, and may be worn in tandem with other EVA gear."
 	icon = 'icons/obj/clothing/head/plasmaman_hats.dmi'
 	worn_icon = 'icons/mob/clothing/head/plasmaman_head.dmi'
-	clothing_flags = STOPSPRESSUREDAMAGE | THICKMATERIAL | SNUG_FIT | PLASMAMAN_HELMET_EXEMPT | PLASMAMAN_PREVENT_IGNITION
+	clothing_flags = STOPSPRESSUREDAMAGE | THICKMATERIAL | SNUG_FIT | PLASMAMAN_HELMET_EXEMPT | PLASMAMAN_PREVENT_IGNITION | HEADINTERNALS
 	icon_state = "plasmaman-helm"
 	inhand_icon_state = "plasmaman-helm"
 	strip_delay = 80