fdo#79668 :File getting corrupt after RT

Problem Description : For some documents containing redLine data there was already processing done for paragraph properties pPr
but when it comes to DocxAttributeOutput::EndParagraphProperties() instead of writing these pPr, LO was calling Redline( pRedlineData )
which has it's pPr inside w:pPrChange.
This was the reason when LO calls WriteCollectedParagraphProperties() after calling Redline() it was writing both paragraph properties
inside single w:shd element.Hence the RT document was getting Corrupt.

Added condition in DocxAttributeOutput::EndParagraphProperties() which is checking for RedlineData and if it's there call
WriteCollectedParagraphProperties() before calling Redline().

Added Export Test case.

Change-Id: I7000c27fe6ee372cac81d6f22e0d3ca9219a24d7
Reviewed-on: https://gerrit.libreoffice.org/9712
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>