plugins.rtpplay: add schema and fix HLS URL (#3627)
plugins.rtpplay: add schema and fix HLS URL (#3627)

Co-authored-by: Miguel Valadas <9e987f31775ac518a52743bc2101aa9fc42f83b1@terma.com>
Co-authored-by: bastimeyer <1d6e1cf70ec6f9ab28d3ea4b27a49a77654d370e@bastimeyer.de>
Co-authored-by: back-to <11d8363aba6e67948c97ce9c29f32aab10054ba3@protonmail.ch>
chhe/streamlink,melmorabity/streamlink,gravyboat/streamlink,streamlink/streamlink,bastimeyer/streamlink,melmorabity/streamlink,streamlink/streamlink,gravyboat/streamlink,bastimeyer/streamlink,chhe/streamlink