videoconvert: New checks are too strict breaking padded allocation cases
Passing padded width/height is getting more and more common. This is achieve by giving padded width/height to the allocator, this was first used by the gstreamer-vaapi plugins. The side effect is that the VideoMeta represent the padded width/height while the caps represent the display width/height. As this is just padding, element using VideoMeta should have to be aware hence should not fail on such a difference.
The following discussion from !696 (merged) should be addressed: