Fix broken ui file
...after
45c4caff685b15a0f1b87ef05436a7e6aca96851 "tdf#144483 sw mail merge:
save ranges in a single document", causing CppunitTest_sw_dialogs_test to fail
with
> warn:vcl.gtk:
2759211:
2759211:vcl/unx/gtk3/gtkinst.cxx:21611: GtkInstanceBuilder: error when calling gtk_builder_add_from_file: ~/lo/core/instdir/share/config/soffice.cfg/modules/swriter/ui/mmresultsavedialog.ui:165:49 Invalid property: GtkCheckButton.group
Change-Id: Ib846f3cb1883de50c28c13441aaf880ae1a480fd
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/122153
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>