ecore-evas/x: rework draw_block unsetting from ConfigureNotify

ecore-evas/x: rework draw_block unsetting from ConfigureNotify

Summary:
draw_block should only be unset if the event is triggered by the wm
or the window is an override, otherwise it prematurely begins rendering
the window at a size which may or may not be accurate

ref T7008

Reviewers: devilhorns, ManMower

Reviewed By: ManMower

Subscribers: ManMower, cedric, #reviewers, #committers

Tags: #efl_display_system

Maniphest Tasks: T7008

Differential Revision: https://phab.enlightenment.org/D6793