Saved resolution reset when quitting the game from taskbar/dock

[blast007]

If you run the game at a resolution different from the desktop resolution, this saved resolution is lost if you quit the game from the Windows taskbar or the Linux/macOS dock. In all cases, I was using SDL2. It seems that the game is saving the current resolution when exiting, which overwrites the desired game resolution with whatever the desktop resolution of the primary display happens to be. Note that this occurs both with the official 2.4.20 release and with the SDL2 fixes in PR #251.