platform: rename create_egl_window to create_egl_surface

Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
diff --git a/clients/nested-client.c b/clients/nested-client.c
index 200543c..615f589 100644
--- a/clients/nested-client.c
+++ b/clients/nested-client.c
@@ -309,8 +309,8 @@
 	client->native = wl_egl_window_create(client->surface,
 					      client->width, client->height);
 
-	client->egl_surface = weston_platform_create_egl_window (client->egl_display,
-								 client->egl_config,
+	client->egl_surface = weston_platform_create_egl_surface(client->egl_display,
+								 nclient->egl_config,
 								 client->native, NULL);
 
 	eglMakeCurrent(client->egl_display, client->egl_surface,