Fix modsuits and defibs (#93373)

## About The Pull Request

Fixes #93359

Caused by #93165

Inventory screen elements were no longer considered reachable, which
broke mousedrop handing on objects that check "is dragging into
inventory slot"

I don't know the best way to fix this yet but I figured the next best
thing would be to make all of these use the `drag_pickup` element, which
skips this reach-ability check

Thus I refactored it slightly to accommodate for items which should
contextually not be drag-pick-up-abble and bam, works like a charm

## Changelog

🆑 Melbert
fix: Dragging defibs and modsuits off your back works again
/🆑

---------

Co-authored-by: ArcaneMusic <41715314+ArcaneMusic@users.noreply.github.com>
Co-authored-by: Xander3359 <66163761+Xander3359@users.noreply.github.com>

code/game/objects/items.dm

@@ -611,7 +611,7 @@
 	if(throwing)
 		throwing.finalize(FALSE)
 	if(loc == user && outside_storage)
-		if(!allow_attack_hand_drop(user) || !user.temporarilyRemoveItemFromInventory(src))
+		if(!can_mob_unequip(user) || !user.temporarilyRemoveItemFromInventory(src))
 			return
 
 	. = FALSE
@@ -621,7 +621,9 @@
 		user.dropItemToGround(src)
 		return TRUE
 
-/obj/item/proc/allow_attack_hand_drop(mob/user)
+/// Called when a mob is manually attempting to unequip the item
+/// Returning FALSE will prevent the unequip from happening
+/obj/item/proc/can_mob_unequip(mob/user)
 	return TRUE
 
 /obj/item/attack_paw(mob/user, list/modifiers)