bnc#865381 DOCX import: table cell btLr text direction fixes

(cherry picked from commit 48b5b7641d0df960558082e8948da8598f801264)
(cherry picked from commit 970160f78ef6cc7abacfa252daa8451e1f0117bb)

Change-Id: I527955671e1100f05da717bffe002131baaf0291
Reviewed-on: https://gerrit.libreoffice.org/8553
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>