Add comma as a property separator

This was not working.

    For: Howl's_Moving_Castle_(2004)_[720p,HDTV,x264,DTS]-FlexGet.avi
    GuessIt found: {
        [1.00] "mimetype": "video/x-msvideo",
        [1.00] "type": "movie",
        [0.60] "title": "Howl's Moving Castle",
        [1.00] "container": "avi",
        [1.00] "year": 2004
    }
    
After the fix:

    For: Howl's_Moving_Castle_(2004)_[720p,HDTV,x264,DTS]-FlexGet.avi
    GuessIt found: {
        [1.00] "mimetype": "video/x-msvideo",
        [1.00] "videoCodec": "h264",
        [1.00] "container": "avi",
        [1.00] "format": "HDTV",
        [0.60] "title": "Howl's Moving Castle",
        [1.00] "screenSize": "720p",
        [1.00] "year": 2004,
        [1.00] "type": "movie",
        [1.00] "audioCodec": "DTS"
    }