[extractor/rumble] Fix format sorting

Closes #6119
Authored by: pukkandan

yt_dlp/extractor/rumble.py

@@ -186,7 +186,7 @@ def _real_extract(self, url):
                         'filesize': 'size',
                         'width': 'w',
                         'height': 'h',
-                    }, default={})
+                    }, expected_type=lambda x: int(x) or None)
                 })
 
         subtitles = {