lastgenre: Fix item_genre instead of item.genre

Co-authored-by: Copilot <[email protected]>

Author: JOJ0

beetsplug/lastgenre/__init__.py

@@ -591,7 +591,7 @@ def lastgenre_func(lib, opts, args):
                                 item_genre = album.genre
                                 label = "inherit from album"
 
-                            if item.genre:
+                            if item_genre:
                                 self._apply_item_genre(item, label, item_genre)
                                 if write:
                                     item.try_write()