janitor keyring now spawns in all janitor's backpacks instead of only the first one's (#83103)

## About The Pull Request

This PR makes it so that all janitors spawn with the keyring, instead of
just the first one.

So the janitor keyring was added roughly a year ago. I like it a lot but
the one aspect that I never quite got was how the spawning worked.
Currently, the janitor keyring spawns for the first janitor only. Any
additional janitors will not get a keyring. The reasoning for doing so
is as follows: (Per Adds the Janitor access keyring #73768 PR):
_"I also wanted to limit how easy this is to greytide/steal, currently
only the first Janitor spawns with the key. I thought it would be too
easy to exploit otherwise, or essentially stolen roundstart if there
were no Janitors."_

Although I understand the idea, I feel like the potential issue was
overblown. There are significantly easier ways to tide than a keyring
that:

1. Requires a head of staff to head to their office and grant keyring
access. (Most heads of staff do not know how to do this, or that you can
even do this)
2. Requires you to fumble with the keys at each door for several
seconds, which makes an incredibly distinct and unique sound.
3. Expires after ten minutes.

This isn't to mention other jobs that either start off with significant
access (paramedic) or jobs that spawn with the tools to tide easily
(engineering).

If the keyring is being used for tiding, the head of staff can revoke
access or have security/department personnel deal with whoever is
abusing access ICly.

## Why It's Good For The Game

Allows multiple janitors to respond to emergency mess calls.
The second (or more) janitors aren't permanently lacking an important
tool of the job the whole shift.

## Changelog
🆑
add: Janitorial keyrings are now part of every janitor's toolkit instead
of just the first one.
/🆑

code/modules/jobs/job_types/janitor.dm

@@ -41,6 +41,7 @@
 	belt = /obj/item/modular_computer/pda/janitor
 	ears = /obj/item/radio/headset/headset_srv
 	skillchips = list(/obj/item/skillchip/job/janitor)
+	backpack_contents = list(/obj/item/access_key)
 
 /datum/outfit/job/janitor/pre_equip(mob/living/carbon/human/human_equipper, visuals_only)
 	. = ..()
@@ -48,11 +49,6 @@
 		backpack_contents += list(/obj/item/gun/ballistic/revolver)
 		r_pocket = /obj/item/ammo_box/a357
 
-	var/static/access_key_given = FALSE
-	if(!access_key_given && !visuals_only)
-		access_key_given = TRUE
-		backpack_contents += list(/obj/item/access_key)
-
 /datum/outfit/job/janitor/get_types_to_preload()
 	. = ..()
 	if(check_holidays(GARBAGEDAY))