replace request.path + '?' + request.query_string with request.original_fullpath in order to avoid appending '?' to redirects that have no query string

lib/two_factor_authentication/controllers/helpers.rb

@@ -21,7 +21,7 @@ module TwoFactorAuthentication
 
       def handle_failed_second_factor(scope)
         if request.format.present? and request.format.html?
-          session["#{scope}_return_to"] = "#{request.path}?#{request.query_string}" if request.get?
+          session["#{scope}_return_to"] = request.original_fullpath if request.get?
           redirect_to two_factor_authentication_path_for(scope)
         else
           render nothing: true, status: :unauthorized