[gtk] Adwaita: Add fontbutton spacing back

[Timm Bäder <baedert src gnome org>]

commit 6abcd8d013fdd8a8d60df47771c1e7680a3e1d0a
Author: Timm Bäder <mail baedert org>
Date:   Sat Jul 13 18:10:15 2019 +0200

    Adwaita: Add fontbutton spacing back

 gtk/theme/Adwaita/_common.scss | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 7a5b05d802..e5fe075d5a 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -858,6 +858,7 @@ button {
   // hide separators
   &.font{
     separator { background-color: transparent; }
+    > box { border-spacing: 6px; }
     > box > box > label { font-weight: bold; }
   }