Converted group by [number|date] pivot table dlg to .ui

Change-Id: I3c6256f1b2d176790a8eb7c094c1583ce053971b
Reviewed-on: https://gerrit.libreoffice.org/8382
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>