Modify initial visibility of a extn_socket

Summary:
extn socket should be rendered even if it is not visible to answer client's requests

extn_socket was rendered even if it's not visible for the first render.
however, it's not rendered as expected because there has been changes for ecore evas idle enterer.
so that this patch changes visibility of extn_socket to answer client's requests immediately.

ref D6054

Reviewers: zmike, jypark

Subscribers: cedric

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D6167

src/modules/ecore_evas/engines/extn/ecore_evas_extn.c

@@ -2143,7 +2143,7 @@ ecore_evas_extn_socket_new_internal(int w, int h)
    ee->engine.ifaces = eina_list_append(ee->engine.ifaces, iface);
 
    ee->rotation = 0;
-   ee->visible = 0;
+   ee->visible = 1;
    ee->w = w;
    ee->h = h;
    ee->req.w = ee->w;