Currently width_align and height_align are zero when encoding with mjpeg_qsv,
which causes "Error submitting the frame for encoding". This patch sets the alignments.

There is a little bit more about the problem here http://ffmpeg.org/pipermail/ffmpeg-user/2019-November/046143.htmlSigned-off-by: JonCookCubic <jon.cook@cubicmotion.com>
Signed-off-by: Zhong Li <zhongli_dev@126.com>