remove setting ec->parent before evaluation.

Summary:
the value of "ec->parent" should be set in evaluation time,
therefore ec->parent->transients will be reset automatically.

Reviewers: devilhorns

CC: cedric

Differential Revision: https://phab.enlightenment.org/D1155

src/modules/wl_desktop_shell/e_mod_main.c

@@ -28,7 +28,6 @@ _e_shell_surface_parent_set(E_Client *ec, struct wl_resource *parent_resource)
 
    e_pixmap_parent_window_set(ec->pixmap, pwin);
 
-   ec->parent = pc;
    ec->icccm.fetch.transient_for = EINA_TRUE;
    ec->icccm.transient_for = pwin;
 }