oauth_google_login: redirect with a trailing / for ERP5JS

ERP5JS web sites, when accessed with their full path, needs the trailing
slash, so add it before redirecting. This should not be a problem in the
case of xhtml style

bt5/erp5_oauth_google_login/SkinTemplateItem/portal_skins/erp5_oauth_google_login/ERP5Site_receiveGoogleCallback.py

@@ -36,6 +36,7 @@ elif code is not None:
     method = getattr(context, "ERP5Site_createGoogleUserToOAuth", None)
     if method is not None:
       method(user_reference, user_dict)
-    return response.redirect(request.get("came_from") or context.absolute_url())
+    # XXX for ERP5JS web sites without a rewrite rule, we make sure there's a trailing /
+    return response.redirect(request.get("came_from") or context.absolute_url() + '/')
 
 return handleError('')

bt5/erp5_oauth_google_login/TestTemplateItem/portal_components/test.erp5.testGoogleLogin.py

@@ -283,7 +283,9 @@ return credential_request
 
     google_hash = self.portal.REQUEST.RESPONSE.cookies.get("__ac_google_hash")["value"]
     self.assertEqual("b01533abb684a658dc71c81da4e67546", google_hash)
-    self.assertEqual(self.portal.absolute_url(), response)
+    absolute_url = self.portal.absolute_url()
+    self.assertNotEqual(absolute_url[-1], '/')
+    self.assertEqual(absolute_url + '/', response)
     cache_dict = self.portal.Base_getBearerToken(google_hash, "google_server_auth_token_cache_factory")
     self.assertEqual(CLIENT_ID, cache_dict["client_id"])
     self.assertEqual(ACCESS_TOKEN, cache_dict["access_token"])