Philip Withnall 45d01e5aa9 gdesktopappinfo: Validate XDG_CURRENT_DESKTOP before using it
Its components are used to build filenames, so if the value of
`XDG_CURRENT_DESKTOP` comes from an untrusted caller (as can happen in
setuid programs), using it unvalidated may be unsafe.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

Helps: #2168
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