Fix missed group in UI template (#6285)

oap-server/server-bootstrap/src/main/resources/ui-initialized-templates/vm.yml

@@ -30,6 +30,7 @@ templates:
         {
           "name": "VM",
           "type": "service",
+          "serviceGroup": "vm",
           "children": [
             {
               "name": "VM",
@@ -200,4 +201,4 @@ templates:
     # False means providing a basic template, user needs to add it manually.
     activated: true
     # True means wouldn't show up on the dashboard. Only keeps the definition in the storage.
-    disabled: false
\ No newline at end of file
+    disabled: false