Fixed for spacing between lines in paragraph.

Problem Description:
In "w:spacing" value of "w:line" attribute value is not getting preserved.

Conflicts:
	sw/qa/extras/ooxmlexport/ooxmlexport.cxx
Reviewed on:
	https://gerrit.libreoffice.org/6645

Change-Id: Id9da4f9234d14cf4599c6520b4a191ad9af92c25