Style pills color for violet theme

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/stylesheets/themes/ui_color.scss

@@ -36,4 +36,8 @@
       }
     }
   }
+
+  .nav-pills > li.active > a, .nav-pills > li.active > a:hover, .nav-pills > li.active > a:focus {
+    background: #658;
+  }
 }