id3v2: fix unsynchronization
The ID3v2 "unsynchronization scheme" requires replacing any 0xFF 0x00 sequences with 0xFF. This has to be done on every byte of the source data, while the current code skipped a byte after a replacement. This meant 0xFF 0x00 0xFF 00 was translated to 0xFF 0xFF 0x00 instead of 0xFF 0xFF. It feels a bit messy to do this correctly with the avio use. But fortunately, this translation can be done in-place, so we can just do it in memory. Inspired by what taglib does. Also see 9ae80e6a. (The sample file for that commit is gone, so it could not be retested.)
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