Merge branch '10538-avatar-css' into 'master'

removes ee differences for avatar.scss

Closes gitlab-ee#10538

See merge request gitlab-org/gitlab-ce!26360

app/assets/stylesheets/framework/avatar.scss

@@ -61,6 +61,10 @@
     border: 0;
   }
 
+  &.avatar-placeholder {
+    border: 0;
+  }
+
   &:not([href]):hover {
     border-color: darken($gray-normal, 10%);
   }