[gtk+/gtk-3-22] Adwaita: remove unneeded margin on dropdown menu

[Lapo Calamandrei <lapo src gnome org>]

commit bb1679b247a8805a9c87a41dcd10a2ae8b2d65d3
Author: Lapo Calamandrei <calamandrei gmail com>
Date:   Tue May 9 12:45:22 2017 +0200

    Adwaita: remove unneeded margin on dropdown menu
    
    That margin was probably a left over to workaround some placement
    issue on dropdowns which doesn't exist anymore.

 gtk/theme/Adwaita/_common.scss |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 17ba5cb..65bd206 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -1917,7 +1917,6 @@ menubar,
 menu,
 .menu,
 .context-menu {
-  margin: 4px;
   padding: 2px 0px;
   background-color: $menu_color;
   border: 1px solid $borders_color; // adds borders in a non composited env