Merge branch '10604-pannels-css' into 'master'

Removes EE differences for panels.scss

Closes gitlab-ee#10604

See merge request gitlab-org/gitlab-ce!26492

app/assets/stylesheets/framework/panels.scss

@@ -7,7 +7,6 @@
   margin-bottom: $gl-vert-padding;
 }
 
-
 .card-header {
   padding: $gl-vert-padding $gl-padding;
   line-height: 36px;