evas: fix lifecycle of Ector renderer.

evas: fix lifecycle of Ector renderer.

Ector renderer are created by a factory pattern which return a reference.
The possible logic improvement from here would be to rely on setting the
parent of the object to the Ector_Surface and manage a cache by intercepting
efl_noref to trigger an efl_del of the object or a temporary cache of it.
That's for later.