[FIX] website: redirect user

Before this commit, user would be redirect to / instead of /my after signup.
That error was detected with task-1829827 which has a tour ensuring user is
correctly redirected to /my after signup on the checkout summary after payment.

Since 0229ef4c4a, the `web_login()` super call order has been changed when
called from the `/web/signup` route.
See the commit for more details but basically, before the fix, it went only
through:
1. web.web_login
2. portal._login_redirect

Where now, it goes through:
1. website.web_login
2. auth_signup.web_login
3. web.web_login
4.portal._login_redirect

Thus, portal._login_redirect is not returning `/my` as redirect anymore.
Indeed, website.web_login will ignore its super() and force redirect to `/`

With this commit, website's user are redirected to /my as expected.
Side effect: website's user will also be redirected to /my on login instead of
`/`, which is also prefered.

closes odoo/odoo#33865

Signed-off-by: Jérémy Kersten (jke) <jke@openerp.com>

addons/website/controllers/main.py

@@ -93,7 +93,7 @@ class Website(Home):
             if request.env['res.users'].browse(request.uid).has_group('base.group_user'):
                 redirect = b'/web?' + request.httprequest.query_string
             else:
-                redirect = '/'
+                redirect = '/my'
             return http.redirect_with_hash(redirect)
         return response