Linux (gtk): Add option saving.


git-svn-id: https://svn.code.sf.net/p/desmume/code/trunk@5019 5577840e-afb3-4e59-9ef3-2b7f898b1952
Linux (gtk): Remove an unused option.


git-svn-id: https://svn.code.sf.net/p/desmume/code/trunk@5020 5577840e-afb3-4e59-9ef3-2b7f898b1952
Linux (gtk): Actually change filter when loading options.


git-svn-id: https://svn.code.sf.net/p/desmume/code/trunk@5021 5577840e-afb3-4e59-9ef3-2b7f898b1952