In the current transport-helper code, refs without namespaced refspecs don't
work correctly, so let's always use them.
Some people reported issues with 'git clone --mirror', and this fixes them, as
well as possibly others.
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>