AMBARI-12251. Widget Browser: Extra scroll bars in widget description.(xiwang)

ambari-web/app/styles/enhanced_service_dashboard.less

@@ -714,7 +714,8 @@
             font-size: 12px;
             display: block;
             color: #808080;
-            overflow: scroll;
+            overflow-x: hidden;
+            overflow-y: scroll;
             height: 40px;
             white-space: pre-line;
           }