[gtk+/gtk-3-22] Adwaita: Restore documented behaviour of .flat

[Daniel Boles <dboles src gnome org>]

commit d6166921a8488f399e69b234056f384faf7f64c2
Author: Daniel Boles <dboles src gnome org>
Date:   Sun Feb 19 12:22:48 2017 +0000

    Adwaita: Restore documented behaviour of .flat
    
    This was changed in commit 0c20604932fa398ec8f52f049bf91b7128ff2e47
    but got clobbered by commit 8817c1ad6d7dede20f7f16c71d088304a7bccacd

 gtk/theme/Adwaita/gtk-contained-dark.css |    2 +-
 gtk/theme/Adwaita/gtk-contained.css      |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/theme/Adwaita/gtk-contained-dark.css b/gtk/theme/Adwaita/gtk-contained-dark.css
index 1102b98..8947117 100644
--- a/gtk/theme/Adwaita/gtk-contained-dark.css
+++ b/gtk/theme/Adwaita/gtk-contained-dark.css
@@ -3848,7 +3848,7 @@ frame > border,
   padding: 0;
   border-radius: 0;
   border: 1px solid #1b1f20; }
-  frame > border.flat,
+  frame.flat > border,
   .frame.flat {
     border-style: none; }
   frame > border:backdrop,
diff --git a/gtk/theme/Adwaita/gtk-contained.css b/gtk/theme/Adwaita/gtk-contained.css
index 48faff4..99f22c7 100644
--- a/gtk/theme/Adwaita/gtk-contained.css
+++ b/gtk/theme/Adwaita/gtk-contained.css
@@ -3879,7 +3879,7 @@ frame > border,
   padding: 0;
   border-radius: 0;
   border: 1px solid #b6b6b3; }
-  frame > border.flat,
+  frame.flat > border,
   .frame.flat {
     border-style: none; }
   frame > border:backdrop,