[Qt 6] Scaling of morph-browser is wrong

Currently we are using the wayland-egl QPA for rendering morph-browser, however due to revert of some patches in mir, we are not really sending correct scaling to the qt client.

Which results in Qt not scaling things properly.

Relevant patch is,

debian/patches/ubports/0009-Revert-Merge-1366.patch

However removing this revert does not fix Qt completely, now wl_output scale is properly sent to Qt, however Qt still sends wrongly sized buffers(?)