[FIX] website: fix traceback when customizing Google Map API key

Since commit [1], which converted the wysiwyg to Owl, trying to
customize the Google Map API key causes a traceback.

Steps to reproduce:
- In edit mode, go to the "Theme" tab.
- Click on the Google Map "Custom Key" button.
=> A traceback appears.

It happens because when getting the parent with the `this.getParent()`
call, the parent is now a `WysiwygAdapterComponent` component and so,
calling the `trigger_up` function on it does not work anymore.

This commit triggers the `gmap_api_key_request` event in a way that is
compatible with the Owl component.

[1]: https://github.com/odoo/odoo/commit/76d4f9811b756f0e57b0a33dbba534c900c7fe15

opw-3489976

closes odoo/odoo#135069

X-original-commit: 355a593fe2dea05a96d0491d684722770533ab7d
Signed-off-by: Romain Derie (rde) <rde@odoo.com>

addons/website/static/src/js/editor/snippets.editor.js

@@ -97,7 +97,7 @@ const wSnippetMenu = weSnippetEditor.SnippetsMenu.extend({
         }
 
         const apiKey = await new Promise(resolve => {
-            this.getParent().trigger_up('gmap_api_key_request', {
+            this.getParent()._websiteRootEvent("gmap_api_key_request", {
                 onSuccess: key => resolve(key),
             });
         });
@@ -212,7 +212,7 @@ const wSnippetMenu = weSnippetEditor.SnippetsMenu.extend({
             alwaysReconfigure: ev.data.reconfigure,
             configureIfNecessary: ev.data.configureIfNecessary,
         });
-        this.getParent().trigger_up(gmapRequestEventName, {
+        this.getParent()._websiteRootEvent(gmapRequestEventName, {
             refetch: reconfigured,
             editableMode: true,
             onSuccess: key => ev.data.onSuccess(key),