Show name of downloader in verbose log

Closes #3703

yt_dlp/YoutubeDL.py

@@ -2833,7 +2833,7 @@ class YoutubeDL:
             urls = '", "'.join(
                 (f['url'].split(',')[0] + ',<data>' if f['url'].startswith('data:') else f['url'])
                 for f in info.get('requested_formats', []) or [info])
-            self.write_debug('Invoking downloader on "%s"' % urls)
+            self.write_debug(f'Invoking {fd.FD_NAME} downloader on "{urls}"')
 
         # Note: Ideally info should be a deep-copied so that hooks cannot modify it.
         # But it may contain objects that are not deep-copyable