Correctly map VK to CHAR
Did tests on winex11 and Windows, and indeed we are failing to correctly map the range of letters' VKs, which is affecting various games by not letting them use these keys at all.
I think that the simpler solution to just hardcode this fact in WAYLAND_MapVirtualKeyEx()
is the best approach, as it just works and we don't risk to break anything by going for something more complex.