[FIX] website: WysiwygAdapter: fix props definition

The `beforeEditorActive` props is a function, not a boolean. So
before this commit, there was a crash in debug mode when the
WysiwygAdapter was instantiated.

Part-of: odoo/odoo#139154

addons/website/static/src/components/wysiwyg_adapter/wysiwyg_adapter.js

@@ -59,7 +59,7 @@ export class WysiwygAdapterComponent extends Wysiwyg {
         wysiwygReady: { type: Function },
         editableElements: { type: true, optional: true },
         savableSelector: { type: String, optional: true },
-        beforeEditorActive: { type: Boolean, optional: true },
+        beforeEditorActive: { type: Function, optional: true },
         removeWelcomeMessage: { type: Function },
     }
     /**