[FIX] web: ActionContainer: properly unbind handler

This isn't a problem in production, because the ActionContainer is
never destroyed, but it caused a small memory leak in the test
environment.

closes odoo/odoo#78621

Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>

addons/web/static/src/webclient/actions/action_container.js

@@ -16,9 +16,9 @@ export class ActionContainer extends Component {
         });
     }
 
-    destroy() {
+    __destroy() {
         this.env.bus.off("ACTION_MANAGER:UPDATE", this);
-        super.destroy();
+        super.__destroy();
     }
 }
 ActionContainer.components = { ActionDialog };