ICONS: Breeze fallsback on galaxy and sifr fallsback on breeze

Change-Id: I06e680caf952152d0a5eb1486f1de330227b60ee
Reviewed-on: https://gerrit.libreoffice.org/15661Reviewed-by: Jan Holesovsky <kendy@collabora.com>
Tested-by: Jan Holesovsky <kendy@collabora.com>

vcl/source/gdi/impimagetree.cxx

@@ -108,7 +108,9 @@ OUString ImplImageTree::fallbackStyle(const OUString &style)
     else if (style == "tango")
         return OUString("galaxy");
     else if (style == "breeze")
-        return OUString("sifr");
+        return OUString("galaxy");
+    else if (style == "sifr")
+        return OUString("breeze");
 
     return OUString("tango");
 }