FIX: Don’t log an error when rendering a 404

Currently, in the list controller, when encountering an unsafe redirect
error, a 404 is rendered. The problem is that it’s done in a way that it
also logs a fatal error (because a `Discourse::NotFound` exception was
raised inside a `rescue_from` block).

This patch addresses that issue by simply rendering a 404 without
raising any error.

app/controllers/list_controller.rb

@@ -50,7 +50,7 @@ class ListController < ApplicationController
                 ].flatten
 
   rescue_from ActionController::Redirecting::UnsafeRedirectError do
-    raise Discourse::NotFound
+    rescue_discourse_actions(:not_found, 404)
   end
 
   # Create our filters