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/reagents/reagent_dispenser.dm

@@ -353,7 +353,8 @@ MAPPING_DIRECTIONAL_HELPERS(/obj/structure/reagent_dispensers/wall/peppertank, 3
 	. = ..()
 	if(prob(1))
 		desc = "IT'S PEPPER TIME, BITCH!"
-	find_and_hang_on_wall()
+	if(mapload)
+		find_and_hang_on_wall()
 
 /obj/structure/reagent_dispensers/water_cooler
 	name = "water cooler"
@@ -611,7 +612,8 @@ MAPPING_DIRECTIONAL_HELPERS(/obj/structure/reagent_dispensers/wall/virusfood, 30
 
 /obj/structure/reagent_dispensers/wall/virusfood/Initialize(mapload)
 	. = ..()
-	find_and_hang_on_wall()
+	if(mapload)
+		find_and_hang_on_wall()
 
 /obj/structure/reagent_dispensers/cooking_oil
 	name = "vat of cooking oil"