[FIX] website: no login_success on oauth redirect

It seems like nobody other than me ever had issues with this line
since its introduction in January 2015, so I just swapped the
conditions, since this param is seemingly always present, unless
you are using oauth with redirect.

addons/website/controllers/main.py

@@ -53,7 +53,7 @@ class Website(openerp.addons.web.controllers.main.Home):
     @http.route(website=True, auth="public")
     def web_login(self, redirect=None, *args, **kw):
         r = super(Website, self).web_login(redirect=redirect, *args, **kw)
-        if request.params['login_success'] and not redirect:
+        if not redirect and request.params['login_success']:
             if request.registry['res.users'].has_group(request.cr, request.uid, 'base.group_user'):
                 redirect = '/web?' + request.httprequest.query_string
             else: