clutter: Move cairo pixel format to cogl

As Cogl already defines a pixel format enum, it makes sense to move such
endian dependant pixel format there

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3086>

src/tests/meta-ref-test.c

@@ -245,7 +245,7 @@ capture_view_into (ClutterStageView *view,
   context = clutter_backend_get_cogl_context (backend);
   bitmap = cogl_bitmap_new_for_data (context,
                                      texture_width, texture_height,
-                                     CLUTTER_CAIRO_FORMAT_ARGB32,
+                                     COGL_PIXEL_FORMAT_CAIRO_ARGB32_COMPAT,
                                      stride,
                                      buffer);