Style balancing groups differently.

guacamole/src/main/webapp/styles/ui.css

@@ -429,6 +429,15 @@ div.section {
     border-left: 1px dotted rgba(0, 0, 0, 0.25);
 }
 
+.group > .caption .icon.type {
+    display: none;
+}
+
+.group.balancer > .caption .icon.type {
+    display: inline-block;
+    background-image: url('../images/protocol-icons/guac-monitor.png');
+}
+
 .group > .caption .icon.group {
     opacity: 0.75;
     background-image: url('../images/group-icons/guac-closed.png');