[gtk] placessidebar: Remove sidebar border again

[Timm Bäder <baedert src gnome org>]

commit 3e54d374de2d855e40be1110a67a334401bcd441
Author: Timm Bäder <mail baedert org>
Date:   Fri Jul 19 08:04:45 2019 +0200

    placessidebar: Remove sidebar border again

 gtk/theme/Adwaita/_common.scss | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index e5fe075d5a..9dbe16c627 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -3986,7 +3986,7 @@ row image.sidebar-icon { opacity: $_placesidebar_icons_opacity; } // dim the sid
                                                                   // on this oddity
 
 placessidebar {
-  > viewport.frame { border-style: none; }
+  > scrolledwindow.frame { border-style: none; }
 
   row {
     // Needs overriding of the GtkListBoxRow padding