GUI2 Handle node additions and removals in Topology view

Change-Id: Ic16fc1325fe338e2136f1cc70febc621342be4f2
diff --git a/web/gui2/src/main/webapp/app/view/topology/layer/forcesvg/forcesvg.component.html b/web/gui2/src/main/webapp/app/view/topology/layer/forcesvg/forcesvg.component.html
index b673b24..58606e9 100644
--- a/web/gui2/src/main/webapp/app/view/topology/layer/forcesvg/forcesvg.component.html
+++ b/web/gui2/src/main/webapp/app/view/topology/layer/forcesvg/forcesvg.component.html
@@ -89,7 +89,7 @@
         <svg:g onos-hostnodesvg [host]="host"
                *ngFor="let host of regionData.hosts[visibleLayerIdx()]"
                onosDraggableNode [draggableNode]="host" [draggableInGraph]="graph"
-                   (newLocation)="nodeMoved('host', device.id, $event)"
+                   (newLocation)="nodeMoved('host', host.id, $event)"
                (selectedEvent)="updateSelected($event)"
                [labelToggle]="hostLabelToggle"
                [scale]="scale">