Integrate quality selection into Plyr

Signed-off-by: Jesús <heckyel@hyperbola.info>

youtube/watch.py

@@ -48,6 +48,7 @@ def get_video_sources(info):
                 'type': 'video/' + fmt['ext'],
                 'quality_string': short_video_quality_string(fmt),
             }
+            source['quality_string'] += ' (integrated)'
             source.update(fmt)
             uni_sources.append(source)
             continue
@@ -661,6 +662,7 @@ def get_watch_page(video_id=None):
             'settings': settings.current_settings_dict,
             'has_manual_captions': any(s.get('on') for s in subtitle_sources),
             **source_info,
+            'using_pair_sources': using_pair_sources,
         },
         font_family=youtube.font_choices[settings.font],
         **source_info,