Evas textblock: Fix linewrap to only wrap if there's a wrap point.

Evas textblock: Fix linewrap to only wrap if there's a wrap point.

For example before the fix, "aaa<b>cccc</>aaa" would have 2 possible
wrap points, <b> and </>, after the fix, those are no longer valid.
Also fixed another issue with wrapping not working.

git-svn-id: http://svn.enlightenment.org/svn/e/trunk/evas@59219 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33