Be more tolerant towards malformed mp4 files

The attached m4a (mp4) file contains an extra byte at the end, which could simply be discarded. Instead jaudiotagger throws an exception.

(I’ll send a fix in a PR)

org.jaudiotagger.audio.exceptions.CannotReadException: Brijean_-_Crushing_on_You.m4a:Unable to find next atom because identifier is invalid mdat
    at org.jaudiotagger.audio.generic.AudioFileReader.read(AudioFileReader.java:130)
    at org.jaudiotagger.audio.AudioFileIO.readFile(AudioFileIO.java:361)
    at org.jaudiotagger.audio.AudioFileIO.read(AudioFileIO.java:197)
    at com.tagtraum.audiokern.AudioMetaData.get(SourceFile:7587)
    ... 12 more
Caused by: org.jaudiotagger.audio.exceptions.InvalidBoxHeaderException: Unable to find next atom because identifier is invalid mdat
    at org.jaudiotagger.audio.mp4.atom.Mp4BoxHeader.update(Mp4BoxHeader.java:166)
    at org.jaudiotagger.audio.mp4.Mp4AtomTree.buildTree(Mp4AtomTree.java:121)
    at org.jaudiotagger.audio.mp4.Mp4AtomTree.<init>(Mp4AtomTree.java:84)
    at org.jaudiotagger.audio.mp4.Mp4InfoReader.read(Mp4InfoReader.java:356)
    at org.jaudiotagger.audio.mp4.Mp4FileReader.getEncodingInfo(Mp4FileReader.java:41)
    at org.jaudiotagger.audio.generic.AudioFileReader.read(AudioFileReader.java:117)
    ... 15 more

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