ecore wayland: fix a regression bug of wayland_transparent_get().
Summary:
wayland transparent func was replaced with alpha's.
By this, transparent common attribute is no more valid,
ecore_evas_transparent_get() doesn't work.
This is a regression bug by
5af84afced98956198b9c316facb671e46b381c1
Reviewers: ManMower, devilhorns
Reviewed By: ManMower, devilhorns
Subscribers: cedric, #reviewers, #committers, zmike
Tags: #efl
Differential Revision: https://phab.enlightenment.org/D6856
Change-Id: Iba22504fa584f4e5b537f2c3b0e6423e72012648