midori: needs GNOME icons to function

Without GNOME icons installed, e.g. when using only core-image-sato,
midori dies violently:
   # midori
   The configuration couldn't be loaded: No such file or directory
   (midori:2915): Gtk-WARNING **: Error loading theme icon 'stock_new-tab' for stock: Icon 'stock_new-tab' not present in theme
   (midori:2915): Gtk-WARNING **: Error loading theme icon 'bookmark-new' for stock: Icon 'bookmark-new' not present in theme
   (midori:2915): Gtk-WARNING **: Error loading theme icon 'stock_add-bookmark' for stock: Icon 'stock_add-bookmark' not present in theme
   Segmentation fault

Signed-off-by: Gary Thomas <gary@mlbassoc.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>