fix(iot-hub): load installed devices when activeType input is set

When the browse component is used on /iot-hub/devices (via items page
component), the parent sets config in its own ngOnInit, so the child's
@Input setter fires AFTER the child's ngOnInit. The DEVICE-specific
loading (vendors + installed items) in ngOnInit never executed because
activeType was still the default WIDGET at that point.

Fix: trigger loading directly in the activeType setter when the value
changes to DEVICE.

ui-ngx/src/app/modules/home/components/iot-hub/iot-hub-browse.component.ts

@@ -70,6 +70,10 @@ export class TbIotHubBrowseComponent implements OnInit, OnDestroy {
   @Input() set activeType(value: ItemType) {
     if (value && value !== this._activeType) {
       this._activeType = value;
+      if (value === ItemType.DEVICE) {
+        this.loadVendors();
+        this.loadInstalledDevices();
+      }
     }
   }
   get activeType(): ItemType {