[MIRROR] Fixes to more Initialize procs (#2733)

* Fixes to more Initialize procs

* Update ai_monitored.dm

* Update cleanable.dm

* Update instruments.dm

* Update musician.dm

* Update noticeboard.dm

* Update mimic.dm

* Update interactive.dm

code/modules/clothing/head/helmet.dm

@@ -19,7 +19,7 @@
 
 
 /obj/item/clothing/head/helmet/Initialize()
-	..()
+	. = ..()
 
 /obj/item/clothing/head/helmet/sec
 	can_flashlight = 1
@@ -195,7 +195,7 @@
 	flags_2 = NONE
 
 /obj/item/clothing/head/helmet/knight/Initialize(mapload)
-	..()
+	. = ..()
 
 /obj/item/clothing/head/helmet/knight/blue
 	icon_state = "knight_blue"