cp#1000015 DOCX export: fix not-well-formed XML on redline end + hyperlink

(cherry picked from commit 7813bd3113beb2b2860f9eb213c5c67ef54f5bf0)

Conflicts:
	sw/qa/extras/ooxmlexport/ooxmlexport.cxx

Change-Id: I3a87a0277952ba0a422df8988151f8b14e166e06
Reviewed-on: https://gerrit.libreoffice.org/6606
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>