Fixes a grinder bug with "anchored" trash contents

Not sure how many other random items might have "anchored" items inside them, but bullet casings are definitely one of those, containing anchored projectiles that would linger on the tile, ready to magdump themselves into the next unlucky person to step in.

modular_chomp/code/modules/recycling/v_garbosystem.dm

@@ -77,6 +77,8 @@
 							items_taken++
 							break
 					for(var/atom/movable/C in A.contents)
+						if(C.anchored)
+							C.anchored = FALSE
 						C.forceMove(loc)
 					if(isitem(A))
 						A.SpinAnimation(5,3)
@@ -115,4 +117,4 @@
 			return
 		else
 			to_chat(user, "Unable to empty filter while the machine is running.")
-	return ..()
+	return ..()