Crashes related to resolution switch.

[supertuxkart-sourceforge-migration]

Author: kristofdm

When you switch resolution in the settings menu and click on either story mode, single-player or multiplayer in the main menu the game will either give a segfault or exit with an error.

The game also crashes when clicking on 'cancel' in the screen that asks you if you want to keep the newly selected resolution.

[supertuxkart-sourceforge-migration]

Author: kristofdm This is a duplicate, the issue is being handled at git: https://github.com/supertuxkart/stk-code/issues/13