evas_render: Process deferred callback in the sync render case.

evas_render: Process deferred callback in the sync render case.

Summary:
The EVAS_CALLBACK_RENDER_POST callback has been deferred when the callback is registered during the render(inside_post_render flag on).

In the sync render case, the logic to call deferred callbacks is missing, and callbacks are not being called in certain cases.

@fix

Reviewers: ManMower, Hermet

Reviewed By: Hermet

Subscribers: zmike, cedric, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D8478