Implements the missing bezerk medbot skin (#89351)

## About The Pull Request


![image](https://github.com/user-attachments/assets/2dd6f05c-8d45-46d7-90a9-b9c87ce3342f)

#89341 resprited medbots but didn't resprite the bezerk bot, despite
tactical medkits still applying said skin.
Also removed an unused trait

Closes #89341

## Why It's Good For The Game

Missing sprites are bad

## Changelog
🆑
fix: Tactical medkits should no longer create invisible medbots
image: Implemented the missing bezerk medbot skin
/🆑

code/__DEFINES/traits/declarations.dm

@@ -379,8 +379,6 @@ Remember to update _globalvars/traits.dm if you're adding/removing/renaming trai
 /// for something granting you a diagnostic hud
 #define TRAIT_DIAGNOSTIC_HUD "diag_hud"
 #define TRAIT_BOT_PATH_HUD "bot_path_hud"
-/// Is a medbot healing you
-#define TRAIT_MEDIBOTCOMINGTHROUGH "medbot"
 #define TRAIT_PASSTABLE "passtable"
 /// Lets you fly through windows
 #define TRAIT_PASSWINDOW "passwindow"

code/_globalvars/traits/_traits.dm

@@ -335,7 +335,6 @@ GLOBAL_LIST_INIT(traits_by_type, list(
 		"TRAIT_MAGICALLY_PHASED" = TRAIT_MAGICALLY_PHASED,
 		"TRAIT_MARTIAL_ARTS_IMMUNE" = TRAIT_MARTIAL_ARTS_IMMUNE,
 		"TRAIT_MANSUS_TOUCHED" = TRAIT_MANSUS_TOUCHED,
-		"TRAIT_MEDIBOTCOMINGTHROUGH" = TRAIT_MEDIBOTCOMINGTHROUGH,
 		"TRAIT_MEDICAL_HUD" = TRAIT_MEDICAL_HUD,
 		"TRAIT_MESON_VISION" = TRAIT_MESON_VISION,
 		"TRAIT_MIME_FAN" = TRAIT_MIME_FAN,

code/_globalvars/traits/admin_tooling.dm

@@ -298,7 +298,6 @@ GLOBAL_LIST_INIT(admin_visible_traits, list(
 		"TRAIT_TOO_TALL" = TRAIT_TOO_TALL,
 		"TRAIT_TOXIMMUNE" = TRAIT_TOXIMMUNE,
 		"TRAIT_TOXINLOVER" = TRAIT_TOXINLOVER,
-		"TRAIT_MEDIBOTCOMINGTHROUGH" = TRAIT_MEDIBOTCOMINGTHROUGH,
 		"TRAIT_TUMOR_SUPPRESSION" = TRAIT_TUMOR_SUPPRESSED,
 		"TRAIT_UI_BLOCKED" = TRAIT_UI_BLOCKED,
 		"TRAIT_UNCONVERTABLE" = TRAIT_UNCONVERTABLE,

code/modules/mob/living/basic/bots/medbot/medbot.dm

@@ -369,12 +369,14 @@
 /mob/living/basic/bot/medbot/mysterious
 	name = "\improper Mysterious Medibot"
 	desc = "International Medibot of mystery."
+	skin = "bezerk"
 	damage_type_healer = HEAL_ALL_DAMAGE
 	heal_amount = 10
 
 /mob/living/basic/bot/medbot/derelict
 	name = "\improper Old Medibot"
 	desc = "Looks like it hasn't been modified since the late 2080s."
+	skin = "bezerk"
 	damage_type_healer = HEAL_ALL_DAMAGE
 	medical_mode_flags = MEDBOT_SPEAK_MODE
 	heal_threshold = 0
@@ -385,6 +387,7 @@
 	desc = "A medibot stolen from a Nanotrasen station and upgraded by the Syndicate. Despite their best efforts at reprogramming, it still appears visibly upset near nuclear explosives."
 	health = 40
 	maxHealth = 40
+	skin = "bezerk"
 	req_one_access = list(ACCESS_SYNDICATE)
 	bot_mode_flags = parent_type::bot_mode_flags & ~BOT_MODE_REMOTE_ENABLED
 	radio_key = /obj/item/encryptionkey/syndicate