plugins.tvplayer: fix bug with some channels not loading
plugins.tvplayer: fix bug with some channels not loading

back-to/streamlink,back-to/streamlink,streamlink/streamlink,bastimeyer/streamlink,gravyboat/streamlink,gravyboat/streamlink,bastimeyer/streamlink,chhe/streamlink,javiercantero/streamlink,wlerin/streamlink,streamlink/streamlink,wlerin/streamlink,melmorabity/streamlink,beardypig/streamlink,melmorabity/streamlink,beardypig/streamlink,chhe/streamlink,javiercantero/streamlink