libavdevice/gdigrab: fix ffmpeg -devices doesn't show gdigrab
missed the category AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT lead to ffmpeg -devices doesn't show gdigrab as a input device FIx #7848 Found-by: dangibson Reviewed-by:Paul B Mahol <onemda@gmail.com> Signed-off-by:
Jun Zhao <barryjzhao@tencent.com>
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