Convert RID_DLG_FORMLINKS to .ui

I converted RID_DLG_FORMLINKS dialog and FormLinkDialog control to .ui

Change-Id: I770b26f98f745f1717e97aa167e73644b7260fe2
Reviewed-on: https://gerrit.libreoffice.org/10808
Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>