Related bnc#862510: extend handling of txXfrm

We don't actually need to check mbAnchorCtr to change
text spacing. This txXfrm workaround works only with rectangles,
because other shapes' text area can be smaller then the shape
size. So add some condition to avoid using it for
other shapes.

Plus fix typos cause regression introduced in:
53c376d35b7223d53e8c9403390afe53d1f69089

(cherry picked from commit 98dd0f2bb5801f974374ef341037e094e4275cbb)

Conflicts:
	sd/qa/unit/import-tests.cxx

Change-Id: I87917b8e0b2bb97ae1bba773e7dda7f81682736f
Reviewed-on: https://gerrit.libreoffice.org/9728
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>