[FIX] website: properly rerender dynamic snippet

Before this commit, changing a filter in the dynamic snippet could
cause errors because the option wasn't awaiting an asynchronous
call.

This commit fixes that by using the same mechanism used in the
s_website_form snippet, relegating the rerenderXML call to updateUI

task-2654924

closes odoo/odoo#80867

X-original-commit: 8a4391a7d6e6988da7b62f6caa91e49c831da774
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

addons/website/static/src/snippets/s_dynamic_snippet/options.js

@@ -62,6 +62,20 @@ const dynamicSnippetOptions = options.Class.extend({
     // Public
     //--------------------------------------------------------------------------
 
+    /**
+     * See from updateUI in s_website_form
+     * 
+     * @override
+     */
+    async updateUI() {
+        if (this.rerender) {
+            this.rerender = false;
+            await this._rerenderXML();
+            return;
+        }
+        await this._super(...arguments);
+    },
+
     /**
      * @override
      */
@@ -252,7 +266,7 @@ const dynamicSnippetOptions = options.Class.extend({
     _filterUpdated: function (filter) {
         if (filter && this.currentModelName !== filter.model_name) {
             this.currentModelName = filter.model_name;
-            this._rerenderXML();
+            this.rerender = true;
         }
     },
     /**