Revert "wayland: Avoid pointer warp if constraint region is invalid"
This reverts commit 7c91c4ba.
It created regressions in some video games. After a closer look at the pointer constraint region handling, there are some issues, but it might be safer to fix them in master.
In meanwhile, let's revert 7c91c4ba because it breaks more things than it fixes.
(cherry picked from commit 07da1796)