General maintenance for wall mounts (#93534)

## About The Pull Request
- Fixes #93392
- Replaces all custom callbacks with call to `deconstruct()`. The
callbacks weren't necessary as it did the same thing as `deconstruct()`
but in an round about way
- Removed duplicate `Initialize()` procs and the params `building` &
`ndir` from all wall mounts. Makes everything cleaner

## Changelog
🆑
fix: wall mounts placed by player now falls off when the wall they are
mounted on is destroyed
code: cleaned up wall mount code
/🆑

code/game/objects/structures/water_structures/urinal.dm

@@ -16,7 +16,7 @@ MAPPING_DIRECTIONAL_HELPERS(/obj/structure/urinal, 32)
 	. = ..()
 	if(mapload)
 		hidden_item = new /obj/item/food/urinalcake(src)
-	find_and_hang_on_wall()
+		find_and_hang_on_wall()
 
 /obj/structure/urinal/Exited(atom/movable/gone, direction)
 	. = ..()