Writer has multiple nested XText and we have to call insertTextContent
on the one that corresponds to the xCursor, so use the convenient
getText() instead of hard-coding the body text.

Change-Id: I86bce48e97730917aa8c4b093bb74c03e3f0dd36
Reviewed-on: https://gerrit.libreoffice.org/57969
Tested-by: Jenkins
Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>