The service implementation used "com.sun.star.frame.UICommandDescription"
since forever, so the IDL file was essentially wrong documentation.
But since 7a464263 converted the service
to new-style, it cannot be instantated any more and e.g. clicking on
Tools->Customize crashes.
(Adapting the implementation instead would be an incompatible change.)

Change-Id: I564bddaf3836827f5b72360a2bde19d6158b7ba5