[DE] Fix bug with review changes panel (it was over dropdown menu in the right panel).

apps/common/main/resources/less/review-changes.less

@@ -5,7 +5,7 @@
     background: @gray-light;
     border: 1px solid @gray-dark;
     height: 35px;
-    z-index: 1000;
+    z-index: @zindex-dropdown - 1;
 
     .review-group {
         display: inline-block;