On macOS, convert relative paths to absolute paths before changing the
working directory. Otherwise, valid Switch formats may incorrectly fail
with a "The ROM format is not supported" error.
Fixes: https://github.com/eden-emulator/Issue-Reports/issues/404
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4105
Reviewed-by: crueter <crueter@eden-emu.dev>
Reviewed-by: Samuel <lizzie@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>