Fixed for spacing between lines having lineRule "auto" is getting preserved

Problem Desciption:
In "w:spacing" value of "w:lineRule" attribute value is not getting is preserved.

Conflicts:
	sw/qa/extras/ooxmlexport/ooxmlexport.cxx
Reviewed on:
	https://gerrit.libreoffice.org/6675

Change-Id: Ie9c99864bd5a198af94c1d251666bcb3427d955a