Ensure protocol order is stable on download page

Sometimes http was first, other times ftp was first. Add an order by clause
to ensure it is the same for all mirrors.

Signed-off-by: Dan McGee <dan@archlinux.org>

public/views.py

@@ -57,7 +57,7 @@ def download(request):
             mirror__public=True, mirror__active=True, mirror__isos=True
     )
     return list_detail.object_list(request, 
-            qset.order_by('mirror__country', 'mirror__name'),
+            qset.order_by('mirror__country', 'mirror__name', 'protocol'),
             template_name="public/download.html",
             template_object_name="mirror_url",
             extra_context={"path": request.path})