Adwaita: increase border radius on button.circular...

...to allow huge circular buttons.
See https://bugzilla.gnome.org/show_bug.cgi?id=770166

gtk/theme/Adwaita/_common.scss

@@ -4243,8 +4243,8 @@ cursor-handle {
 .context-menu { font: initial; } // Decouple the font of context menus from their entry/textview
 
 button.circular { // FIXME: aggregate to buttons
-  border-radius: 20px;
-  -gtk-outline-radius: 20px;
+  border-radius: 9999px;
+  -gtk-outline-radius: 9999px;
 
   label { padding: 0; }
 }

gtk/theme/Adwaita/gtk-contained-dark.css

@@ -4563,8 +4563,8 @@ cursor-handle {
   font: initial; }
 
 button.circular {
-  border-radius: 20px;
-  -gtk-outline-radius: 20px; }
+  border-radius: 9999px;
+  -gtk-outline-radius: 9999px; }
   button.circular label {
     padding: 0; }
 

gtk/theme/Adwaita/gtk-contained.css

@@ -4594,8 +4594,8 @@ cursor-handle {
   font: initial; }
 
 button.circular {
-  border-radius: 20px;
-  -gtk-outline-radius: 20px; }
+  border-radius: 9999px;
+  -gtk-outline-radius: 9999px; }
   button.circular label {
     padding: 0; }