[mutter] clutter/stage-cogl: Use default frame rate instead of hardcoded 60Hz

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit a76762a05eb2f69776eecbe04e69504e0b234ba2
Author: Daniel van Vugt <daniel van vugt canonical com>
Date:   Tue Apr 2 16:55:47 2019 +0800

    clutter/stage-cogl: Use default frame rate instead of hardcoded 60Hz
    
    Instead of 0Hz falling back to 60Hz, use `CLUTTER_DEFAULT_FPS` which is
    also 60Hz by default.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/363

 clutter/clutter/cogl/clutter-stage-cogl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/clutter/clutter/cogl/clutter-stage-cogl.c b/clutter/clutter/cogl/clutter-stage-cogl.c
index aa698ac15..1f69b3092 100644
--- a/clutter/clutter/cogl/clutter-stage-cogl.c
+++ b/clutter/clutter/cogl/clutter-stage-cogl.c
@@ -198,8 +198,8 @@ clutter_stage_cogl_schedule_update (ClutterStageWindow *stage_window,
     }
 
   refresh_rate = stage_cogl->refresh_rate;
-  if (refresh_rate == 0.0)
-    refresh_rate = 60.0;
+  if (refresh_rate <= 0.0)
+    refresh_rate = clutter_get_default_frame_rate ();
 
   refresh_interval = (gint64) (0.5 + G_USEC_PER_SEC / refresh_rate);
   if (refresh_interval == 0)