A negative scale of the parent matrix indicates that the shape needs to
be flipped. This commit fixes text rotation as well, so
d742c001 is no longer needed.

Change-Id: I67bba34519b3af9215fe64a71f5137aa510edf7a
Reviewed-on: https://gerrit.libreoffice.org/42250Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tamás Zolnai <tamas.zolnai@collabora.com>