Fix "Open theme" button double path concat #880
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On Manjaro ran into issue that open theme button tries to open
{pwd}/{theme_dir}(i.e./home/user/repo/"/home/user/repo/res/themes").Found that this is due to essentially double quoting the arguments of
subprocess.Popen.subprocess.Popenarguments do not need to have extra quotes applied (the documentation recommends validating this with shlex.split()).The submitted change affects only the subprocess.Popen calls and leaves Windows as it was.
Fixes #868