for-each-ref: avoid color leakage

for-each-ref: avoid color leakage

To make sure that an invocation like the following doesn't leak color,

  $ git for-each-ref --format='%(subject)%(color:green)'

auto-reset at the end of the format string when the last color token
seen in the format string isn't a color-reset.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>