[libadwaita/wip/exalm/revert-headers: 2/3] Revert "stylesheet: Restore a backdrop state for header bar"

[Alexander Mikhaylenko <alexm src gnome org>]

commit 284af49bcc883959609eb3729f7eb4a0d74ca73d
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Thu Jun 24 22:29:37 2021 +0500

    Revert "stylesheet: Restore a backdrop state for header bar"
    
    This reverts commit a7636b0c35da8620f0204a0ab1f16b049f505970.

 src/stylesheet/widgets/_header-bar.scss | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)
---
diff --git a/src/stylesheet/widgets/_header-bar.scss b/src/stylesheet/widgets/_header-bar.scss
index b19f9c2a..7ad8caea 100644
--- a/src/stylesheet/widgets/_header-bar.scss
+++ b/src/stylesheet/widgets/_header-bar.scss
@@ -16,17 +16,15 @@ headerbar {
   }
 
   &:backdrop {
-    filter: brightness(.92);
+    background-color: $headerbar_bg_color;
 
     transition: $backdrop_transition;
-    transition-property: filter;
 
     > windowhandle {
       // opacity looks weird with GtkSwitch, but filter works fine
       filter: opacity(0.5);
 
       transition: $backdrop_transition;
-      transition-property: filter;
     }
   }