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

Change-Id: I87917b8e0b2bb97ae1bba773e7dda7f81682736f