t0000-basic: Add ls-tree recursive test back.

t0000-basic: Add ls-tree recursive test back.

When we updated ls-tree recursive output to omit the tree nodes,
246cc52f388cae8ca99e5a12b8458c9bfa467765 adjusted the old test
so that we do not expect to see trees in its output.  Later,
with 0f8f45cb4a7e664b396f73c25891da46b953b8b8, we added back the
ability to show both with -t option, but we forgot to update the
test as well.

Signed-off-by: Junio C Hamano <junkio@cox.net>