videoscale: Fix the src video info error in transfer_colorimetry_from_input()
Pipeline such as:
gst-launch-1.0 -vf videotestsrc ! video/x-raw,format=NV12,colorimetry=(string)bt709
! videoscale ! video/x-raw,format=I420 ! fakesink
Always trigger a error:
ERROR video-info video-info.c:556:gst_video_info_from_caps: no width property given
Because it is called before the fixate_size(), the src caps' resolution may be absent or not fixed. That causes that the src video info can not be created correctly and we can not inherit the colorimetry and chroma-site from the input caps.