skip ID3v2 footer while parsing ID3 tags

able to playback first MP3 : http://95.85.48.238:1935/vod/mp3:CircleOfSea.mp3/media_w583619514_0.mp3
related to https://github.com/mangui/HLSprovider/issues/72
should fix https://github.com/mangui/HLSprovider/issues/49