Updates the sprite of the bulldog shotgun and fixes some related code (#85121)

Fixes bulldog shotgun unique mag display not working on the sprite, resprites the bulldog shotgun along with inhands and new worn sprites and cleans up a little of the code surrounding the bulldog.

code/modules/projectiles/boxes_magazines/external/shotgun.dm

@@ -14,25 +14,30 @@
 
 /obj/item/ammo_box/magazine/m12g/stun
 	name = "shotgun magazine (12g taser slugs)"
+	icon_state = "m12gs"
 	base_icon_state = "m12gs"
 	ammo_type = /obj/item/ammo_casing/shotgun/stunslug
 
 /obj/item/ammo_box/magazine/m12g/slug
 	name = "shotgun magazine (12g slugs)"
+	icon_state = "m12gsl"
 	base_icon_state = "m12gsl"
 	ammo_type = /obj/item/ammo_casing/shotgun
 
 /obj/item/ammo_box/magazine/m12g/dragon
 	name = "shotgun magazine (12g dragon's breath)"
+	icon_state = "m12gf"
 	base_icon_state = "m12gf"
 	ammo_type = /obj/item/ammo_casing/shotgun/dragonsbreath
 
 /obj/item/ammo_box/magazine/m12g/bioterror
 	name = "shotgun magazine (12g bioterror)"
+	icon_state = "m12gt"
 	base_icon_state = "m12gt"
 	ammo_type = /obj/item/ammo_casing/shotgun/dart/bioterror
 
 /obj/item/ammo_box/magazine/m12g/meteor
 	name = "shotgun magazine (12g meteor slugs)"
+	icon_state = "m12gbc"
 	base_icon_state = "m12gbc"
 	ammo_type = /obj/item/ammo_casing/shotgun/meteorslug

code/modules/projectiles/guns/ballistic/shotgun.dm

@@ -140,12 +140,15 @@
 
 /obj/item/gun/ballistic/shotgun/bulldog
 	name = "\improper Bulldog Shotgun"
-	desc = "A 2-round burst fire, mag-fed shotgun for combat in narrow corridors, nicknamed 'Bulldog' by boarding parties. Compatible only with specialized 8-round drum magazines. Can have a secondary magazine attached to quickly swap between ammo types, or just to keep shooting."
+	desc = "A 2-round burst fire, mag-fed shotgun for combat in narrow corridors, \
+		nicknamed 'Bulldog' by boarding parties. Compatible only with specialized 8-round drum magazines. \
+		Can have a secondary magazine attached to quickly swap between ammo types, or just to keep shooting."
 	icon_state = "bulldog"
-	inhand_icon_state = "bulldog"
-	worn_icon_state = "cshotgun"
 	lefthand_file = 'icons/mob/inhands/weapons/guns_lefthand.dmi'
 	righthand_file = 'icons/mob/inhands/weapons/guns_righthand.dmi'
+	inhand_icon_state = "bulldog"
+	worn_icon = 'icons/mob/clothing/back.dmi'
+	worn_icon_state = "bulldog"
 	inhand_x_dimension = 32
 	inhand_y_dimension = 32
 	projectile_damage_multiplier = 1.2
@@ -166,9 +169,9 @@
 	internal_magazine = FALSE
 	tac_reloads = TRUE
 	burst_fire_selection = TRUE
-	///the type of secondary magazine for the bulldog
+	/// The type of secondary magazine for the bulldog
 	var/secondary_magazine_type
-	///the secondary magazine
+	/// The secondary magazine
 	var/obj/item/ammo_box/magazine/secondary_magazine
 
 /obj/item/gun/ballistic/shotgun/bulldog/Initialize(mapload)
@@ -199,8 +202,6 @@
 		. += "[icon_state]_secondary_mag_[initial(secondary_magazine.icon_state)]"
 		if(!secondary_magazine.ammo_count())
 			. += "[icon_state]_secondary_mag_empty"
-	else
-		. += "[icon_state]_no_secondary_mag"
 
 /obj/item/gun/ballistic/shotgun/bulldog/handle_chamber(empty_chamber = TRUE, from_firing = TRUE, chamber_next_round = TRUE)
 	if(!secondary_magazine)