Adwaita: colorswatch focus rings

- there used to be different outline color for light and dark buttons,
  but it's complexity I can live without. blue focus rings fit all.

Fixes https://gitlab.gnome.org/GNOME/gtk/-/issues/2695

gtk/theme/Adwaita/_common.scss

@@ -3902,7 +3902,7 @@ colorswatch {
   }
 
   &.dark {
-    outline-color: transparentize(white, 0.4);
+
 
     > overlay {
       color: white;
@@ -3914,7 +3914,7 @@ colorswatch {
   }
 
   &.light {
-    outline-color: transparentize(black, 0.4);
+
 
     > overlay {
       color: black;