plugins.zattoo: use 'dash' as default stream
plugins.zattoo: use 'dash' as default stream

'hls' was removed and can't be used anymore,
'hls5', 'hls7' or 'dash' is only available

streamlink/streamlink,gravyboat/streamlink,gravyboat/streamlink,melmorabity/streamlink,streamlink/streamlink,melmorabity/streamlink,bastimeyer/streamlink,bastimeyer/streamlink,chhe/streamlink,chhe/streamlink