evas_textblock_tests: do not free a text cursor here
the cur_obj would have been always dead at this point, as the textblock
was freed. This now moved the textcursor object to a previous point.
However, we could also remove the explicit cursor deletion...
Reviewed-by: Mike Blumenkrantz <firstname.lastname@example.org>
Differential Revision: https://phab.enlightenment.org/D11596