[nautilus] Adwaita: Remove the icon for the devel style

[Carlos Soriano <csoriano src gnome org>]

commit 2b5bb20c943ab8845a23f50d0f6673debb1dc748
Author: Carlos Soriano <csoriano gnome org>
Date:   Sat Apr 28 20:07:29 2018 +0200

    Adwaita: Remove the icon for the devel style
    
    Jakub didn't find it very pleasant, and it kinda gets in the way.
    
    The coloring should be enough too.

 src/resources/css/Adwaita.css | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/resources/css/Adwaita.css b/src/resources/css/Adwaita.css
index a19754388..fcb1843e6 100644
--- a/src/resources/css/Adwaita.css
+++ b/src/resources/css/Adwaita.css
@@ -5,7 +5,7 @@
 }
 
 .nautilus-window.devel headerbar {
-    background: #cbd2d9 -gtk-icontheme("system-run-symbolic") 70% 0/64px 64px no-repeat, linear-gradient(to 
left, #a5b1bd 0%, #a5b1bd 8%, @theme_bg_color 25%);
+    background: linear-gradient(to left, #a5b1bd 0%, #a5b1bd 8%, @theme_bg_color 25%);
     box-shadow: inset 0 1px #f1f3f5;
     border-color: #909fae;
     color: rgba(46, 52, 54, 0.2);