debian: set fallback to 'gnome' icon theme
debian: set fallback to 'gnome' icon theme

Signed-off-by: Matt Sealey <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@genesi-usa.com>

genesi/gtk2,genesi/gtk2,genesi/gtk2,genesi/gtk2,genesi/gtk2