ui/console: egl-headless is compatible with non-gl listeners

Fix a regression introduced by commit 5e79d516e ("ui: split the GL
context in a different object").

Reported-by: Akihiko Odaki <akihiko.odaki@gmail.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>

ui/egl-headless.c

@@ -170,6 +170,14 @@ static bool
 egl_is_compatible_dcl(DisplayGLCtx *dgc,
                       DisplayChangeListener *dcl)
 {
+    if (!dcl->ops->dpy_gl_update) {
+        /*
+         * egl-headless is compatible with all 2d listeners, as it blits the GL
+         * updates on the 2d console surface.
+         */
+        return true;
+    }
+
     return dcl->ops == &egl_ops;
 }