improve demo app

examples/demo/message.js

@@ -1,14 +1,17 @@
-const template = `
+import { Counter } from "./counter.js";
+
+export class Message extends odoo.core.Component {
+  inlineTemplate = `
     <div class="message">
         <span class="author"><t t-esc="props.author"/></span>
         <span class="msg"><t t-esc="props.msg"/></span>
         <button class="remove" t-on-click="removeMessage">Remove</button>
+        <t t-widget="Counter" t-props="{initialState: props.id}"/>
     </div>`;
 
-export class Message extends odoo.core.Component {
   constructor(parent, props) {
     super(parent, props);
-    this.inlineTemplate = template;
+    this.widgets = { Counter };
   }
 
   removeMessage() {