Revert code that push copy of 'rPr' inside 'pPr' in DOCX export

There was code that was inserted by commit id
'8c178a50334109b34ef456ca6aa51cd3d98699ae' that added logic to
also export 'rPr' in the 'pPr' node.
The 'rPr' represents the paragraph marker formatting.
However - simply copying the last run's formatting and assuming
it is the same for the paragraph marker should not be used.

Also refer to 'aafffe6d1c3734fb2acef4b2bb1385c1e2f49043' for
details on test-case disable.

Change-Id: I6004e4c706abfeb5f51d86d11d3ebf46256a68c5
Reviewed-on: https://gerrit.libreoffice.org/7121
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>