fix: add self to method to prevent TypeErrors

Author: liquidz00

src/patcher/utils/installomator.py

@@ -144,7 +144,7 @@ async def _create_label_dir(self, fragments: List[Fragment]) -> bool:
         results = await asyncio.gather(*tasks)
         return all(result is True for result in results)
 
-    async def _filter_label(label: Label) -> Optional[Label]:
+    async def _filter_label(self, label: Label) -> Optional[Label]:
         """Returns None if passed label is unsupported or ignored."""
         if (
             label.type.startswith("UNSUPPORTED")