gnome-text-editor: only handle spellcheck language if needed
    
    The Flatpak build doesn't have the spellcheck issue at the
    moment, and it may be fixed soon in the RPM build. Trying to
    'fix' the issue on the flatpak build actually makes the test
    fail. So, let's only do the fix if we actually have a misspelled
    word.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>