fix: don't remove from gacha if item amount is unlimited

exts/gacha/gacha_admin.py

@@ -962,7 +962,7 @@ async def gacha_add_item_to(
                     }
                 )
 
-            if remove_amount_from_gacha:
+            if remove_amount_from_gacha and item.amount != -1:
                 batch.prismagachaitem.update(
                     data={"amount": {"decrement": amount}},
                     where={"id": item.id},