[gtk] adwaita: Use proper transform for spinners

[Timm Bäder <baedert src gnome org>]

commit f49a02e5b5400cd6b72fb94eea8212feb766a249
Author: Timm Bäder <mail baedert org>
Date:   Sat Jun 6 15:38:53 2020 +0200

    adwaita: Use proper transform for spinners

 gtk/theme/Adwaita/_common.scss | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index c4c14e4dab..d94962dd98 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -215,7 +215,7 @@ window.assistant {
  * Spinner Animation *
  *********************/
 @keyframes spin {
-  to { -gtk-icon-transform: rotate(1turn); }
+  to { transform: rotate(1turn); }
 }
 
 spinner {