Add fallback if irrlicht won't report any resolution.
fix video options dialog
Merge pull request #1439 from konstin/master

fix video options dialog
Keep flying karts parallel to the ground in the physics, not outside.
This avoids odd side effects that happened before (e.g. very bad collisions
with track; problems when dropping karts on rescue on the walldriving branch).
Merge remote-tracking branch 'origin/master' into bumpy