- Return in Unlock Play Modes goes to Game Options instead of the main menu
- changing some Graphics Options settings no longer plays two menu select sounds, which was really loud :(
- Return in Game Pad Options plays the menu select sound
- turning off Screen Effects plays the menu select sound
Follow-up to #19 which did the change for macOS.
It appears to work as expected on Linux too.
Tested on a distro where XDG_DATA_HOME is undefined by default,
and `PHYSFS_getPrefDir` also resolves to `~/.local/share/VVVVVV/`.
The first organization parameter is unused on Linux and macOS.
Instead use PHYSFS_getPrefDir which does the same than the manual
concatenation done before. The organization name argument is required
but is not used on macOS.
