[FIX] website: fix traceback when refreshing with f5 or ctrl+r

[1] removed the `router.redirect` method but [2] which was forward
ported after from 16.0 used the redirect method where it still existed.

This causes a traceback when using f5 or ctrl+r.

This commit fixes that by using the proper method in 16.2+

[1]: https://github.com/odoo/odoo/commit/365fe390fdc814bc079419f0bd940b8edd652618
[2]: https://github.com/odoo/odoo/commit/45affc3a94f33478063d2e82be5e0c51df92fb5f

task-3458691

closes odoo/odoo#134764

X-original-commit: dec96bca556b8df23fb692587cb64b47a6a3206b
Signed-off-by: Romain Derie (rde) <rde@odoo.com>

addons/website/static/src/client_actions/website_preview/website_preview.js

@@ -498,8 +498,8 @@ export class WebsitePreview extends Component {
         }
         ev.preventDefault();
         const path = this.websiteService.contentWindow.location;
-        const debugMode = this.env.debug ? `?debug=${odoo.debug}` : "";
-        this.router.redirect(
+        const debugMode = this.env.debug ? `?debug=${this.env.debug}` : "";
+        browser.location.assign(
             `/web${debugMode}#action=website.website_preview&path=${encodeURIComponent(path)}`
         );
     }