Evas Textblock: Fix ellipsis when textblock is resized to formatted h.

Evas Textblock: Fix ellipsis when textblock is resized to formatted h.

Summary:
it->h is sum of max ascent and max descent. It shouldn't be used
when handle ellipsis. Because, Evas Textblock uses these values for
each lines differently according to its location.
(start, end, else, single)
So, for handling ellipsis exactly, it has to be fixed.

Test Plan: A test case is included in Evas Test suite.

Reviewers: woohyun, tasn, herdsman

Subscribers: cedric, jpeg

Differential Revision: https://phab.enlightenment.org/D3475