The shape wasn't imported correctly because IsPostRotateAngle wasn't
set. As a result the shape was flipped after it was rotated instead
of before. This commit removes 1c44b263 and converts the rotation to
the internal format instead. This also fixes that ooxml preset shapes
can't be exported to odf correctly and that ooxml preset shapes rotate
in the wrong direction when rotated in LO.

Change-Id: I9691902fdfb2cfecc8fe50d6eb66ac3880ddd4e8
Reviewed-on: https://gerrit.libreoffice.org/40789Reviewed-by: Tamás Zolnai <tamas.zolnai@collabora.com>
Tested-by: Tamás Zolnai <tamas.zolnai@collabora.com>