[s] Blocks any doubled wall mount placement (#27016)

* Blocks any doubled wall mount placement

* Fixes direction stuff

* Remove old code

code/game/objects/items/mountable_frames/frames.dm

@@ -22,15 +22,15 @@
 
 /obj/item/mounted/frame/try_build(turf/on_wall, mob/user)
 	if(!..())
-		return
+		return FALSE
 
 	var/turf/build_turf = get_turf(user)
 	if((mount_requirements & MOUNTED_FRAME_SIMFLOOR) && !isfloorturf(build_turf))
 		to_chat(user, "<span class='warning'>[src] cannot be placed on this spot.</span>")
-		return
+		return FALSE
 	if(mount_requirements & MOUNTED_FRAME_NOSPACE)
 		var/area/my_area = get_area(build_turf)
 		if(!istype(my_area) || !my_area.requires_power || isspacearea(my_area))
 			to_chat(user, "<span class='warning'>[src] cannot be placed in this area.</span>")
-			return
+			return FALSE
 	return TRUE

code/game/objects/items/mountable_frames/mountables.dm

@@ -14,17 +14,18 @@
 
 /obj/item/mounted/proc/try_build(turf/on_wall, mob/user, proximity_flag) //checks
 	if(!on_wall || !user)
-		return
+		return FALSE
 	if(!proximity_flag) //if we aren't next to the turf
-		return
+		return FALSE
+
 	if(!allow_floor_mounting)
 		if(!(get_dir(on_wall, user) in GLOB.cardinal))
 			to_chat(user, "<span class='warning'>You need to be standing next to [on_wall] to place [src].</span>")
-			return
+			return FALSE
 
-		if(gotwallitem(get_turf(user), get_dir(on_wall, user)))
+		if(gotwallitem(get_turf(user), get_dir(user, on_wall)))
 			to_chat(user, "<span class='warning'>There's already an item on this wall!</span>")
-			return
+			return FALSE
 
 	return TRUE