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/fireaxe.dm

@@ -38,7 +38,8 @@ MAPPING_DIRECTIONAL_HELPERS(/obj/structure/fireaxecabinet, 32)
 	if(populate_contents)
 		held_item = new item_path(src)
 	update_appearance()
-	find_and_hang_on_wall()
+	if(mapload)
+		find_and_hang_on_wall()
 
 /obj/structure/fireaxecabinet/Destroy()
 	if(held_item)