presence-chooser: Grey the 'favorite' icon when the status is not a favorite
presence-chooser: Grey the 'favorite' icon when the status is not a favorite

This is more coherent as the favorite icon is now theme dependent and fix the
problem that the old unstarred icon was not really visible (#584629).

GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets,Distrotech/telepathy-account-widgets