viewer: take pixel_format into account when setting gstappsrc caps.
viewer: take pixel_format into account when setting gstappsrc caps.

AravisProject/aravis,lu-zero/aravis,AravisProject/aravis,AnilRamachandran/aravis,lu-zero/aravis,AravisProject/aravis,AravisProject/aravis,AnilRamachandran/aravis,lu-zero/aravis,AnilRamachandran/aravis,AnilRamachandran/aravis,lu-zero/aravis,AnilRamachandran/aravis,lu-zero/aravis,AravisProject/aravis