In wg_transform we only want to remove width/height/framerate if the
transform supports format change, and we want to keep the caps fixed
otherwise so we can use gst_caps_is_always_compatible to monitor caps
changes.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=45988
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=47084
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=49715
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=52183Signed-off-by: Rémi Bernon <rbernon@codeweavers.com>