Should use relative and not absolute paths

[Erick-BR]

Describe the bug
I use the emulator on a pendrive and depending on the machine the drive letter changes. some settings are lost like firmware, save, screenshots.

To Reproduce
Just change directory to another drive.

Expected behavior
Should use relative paths for all configurations "./firmware", "./saves", "./screenshots"... like the almost absolute majority of all other emulators.

[remutro]

The default paths all use a relative path, but if you browse to select a different directory then yes it will use the absolute path as that is how the open file picker works.

Out of curiosity, does it work if you manually edit the paths in the settings.bml file to be a relative path after setting them up? Some of this stuff is setup to be as foolproof as possible so users can't get themselves into trouble setting inappropriate paths.