[youtube] Fix for new accounts

Cookies for some new accounts doesn't work with age-gated videos without `has_verified=1`

youtube_dlc/extractor/youtube.py

@@ -1414,7 +1414,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
         url, smuggled_data = unsmuggle_url(url, {})
         video_id = self._match_id(url)
         base_url = self.http_scheme() + '//www.youtube.com/'
-        webpage_url = base_url + 'watch?v=' + video_id
+        webpage_url = base_url + 'watch?v=' + video_id + '&has_verified=1'
         webpage = self._download_webpage(webpage_url, video_id, fatal=False)
 
         player_response = None