demux: mp4: fix can't recognize clcp media type's closed caption

in TrackCreateES() don't compare case of i_handler is ATOM_clcp
It makes can't create track for clcp media type
print this debug messages and vlc player can't recognize closed caption

debug messages:
    mp4 demux debug: track[Id 0x4] read 32 samples length:80s
    mp4 demux error: cannot create es for track[Id 0x4]
    mp4 demux debug: ignoring track[Id 0x4]

I tested by using this sample videos:
    https://sampleplatform.ccextractor.org/sample/download/45
    https://sampleplatform.ccextractor.org/sample/download/130

reference:
    https://developer.apple.com/library/archive/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html#//apple_ref/doc/uid/TP40000939-CH205-SW87


Signed-off-by: Francois Cartegnie <fcvlcdev@free.fr>