[FIX] website: fix opening the page manager in debug mode

Before this commit, opening the Page Manager in debug mode would throw
an error, stating that the website.RecordFilter has a t-foreach with
duplicated keys.

As per the [owl documentation]: "Owl requires the presence of a t-key
directive, to be able to properly reconcile renderings." and "A key
should be a unique number or string."

This commit fixes the keys to be the website id instead of the website
object.

[owl documentation]: https://github.com/odoo/owl/blob/master/doc/reference/templates.md#loops

closes #104425

Signed-off-by: Romain Derie (rde) <rde@odoo.com>

addons/website/static/src/components/views/page_list.xml

@@ -41,7 +41,7 @@
             <i class="me-1 fa fa-globe"/><span t-esc="state.activeWebsite.name"/>
         </button>
         <div class="dropdown-menu">
-            <t t-foreach="websiteSelection" t-as="website" t-key="website">
+            <t t-foreach="websiteSelection" t-as="website" t-key="website.id">
                 <a role="menuitem" href="#" class="dropdown-item" t-on-click="() => this.onSelectWebsite(website)"><t t-esc="website.name"/></a>
                 <div t-if="!website.id" class="dropdown-divider"/>
             </t>