fdo#81384: writerfilter: turn the horrible btLr cell text dir hack

... by 5 degrees to starboard, which lets the row in the bugdoc appear,
altough the height is a bit insufficient still.  Why that works, is a
nautic mystery to me, i'd say this whole btLr emulation nonsense needs
to be keel-hauled, but after this patch i'll need some rum, arrrr...

(regression from commit 0208ead70a9412ccd554fcef3e9308f8ca17037b
 and commit 970160f78ef6cc7abacfa252daa8451e1f0117bb)

Change-Id: Ie0c6ec88b6d6635379b9127f6460647f14776aad
(cherry picked from commit 5893a7536a0bbce57c4a2f89680dcb4cff3d06d7)
Reviewed-on: https://gerrit.libreoffice.org/10627
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>