window/x11: Ignore the _NET_WM_BYPASS_COMPOSITOR = 1 hint

We already detect all the cases that allow a window to be properly
unredirected. Using this hint to bypass some of those checks only causes
windows that can not be unredirected properly to get unredirected
regardless.

Related: https://gitlab.gnome.org/GNOME/mutter/-/issues/2434
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2651>