v4l2object: use v4l2 reported width for padded_width when complex video formats
requested to merge Shengqi.Yu/gstreamer:v4l2object-use-v4l2-reported-width-for-padded_width-when-complex-video-formats into main
Stride means bytes perline, and padded_width means pixels. Here, padded_width shoule be pix width reported by v4l2 instead of stride.