xwayland: Check emulation on client toplevel resize

When a reparented window is resized directly check the emulation instead of
doing this only when the window manager parent window is resized, what might
never happen.

For that to work we need to make sure that we compare the current size of the
client toplevel when looking for an emulated mode.

Signed-off-by: Roman Gilg <subdiff@gmail.com>
3 jobs for xwl-emulation in 6 minutes and 45 seconds (queued for 1 second)
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00:00:50

 
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passed autotools-build-and-test #1267830

00:05:55

passed meson-build-and-test #1267831

00:01:52