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/modules/paperwork/ticketmachine.dm

@@ -31,7 +31,8 @@
 /obj/machinery/ticket_machine/Initialize(mapload)
 	. = ..()
 	update_appearance()
-	find_and_hang_on_wall()
+	if(mapload)
+		find_and_hang_on_wall()
 
 /obj/machinery/ticket_machine/Destroy()
 	for(var/obj/item/ticket_machine_ticket/ticket in tickets)