Fixes bluespace bodybag duping (#77067)

## About The Pull Request

Folded bluespace bodybags had no prior checks to see if the person
picking the item up was the one inside of the bag. This naturally broke
things, because BYOND doesn't like it when you have an infinite cycle of
locs, so it refuses to move the folded bluespace item onto your mob.
This then leads to the bluespace bodybag duping bug, as the item is
still in your hand even though it really isn't.
## Why It's Good For The Game

Fixes #44902 
## Changelog
🆑
fix: Fixed a rare bug that let you spam bluespace bodybags everywhere.
/🆑

code/game/objects/items/bodybag.dm

@@ -20,6 +20,12 @@
 		if(isopenturf(target))
 			deploy_bodybag(user, target)
 
+/obj/item/bodybag/attempt_pickup(mob/user)
+	// can't pick ourselves up if we are inside of the bodybag, else very weird things may happen
+	if(contains(user))
+		return TRUE
+	return ..()
+
 /**
  * Creates a new body bag item when unfolded, at the provided location, replacing the body bag item.
  * * mob/user: User opening the body bag.