git-cvsserver: fix disabling service via per-method config

When the per-method enable logic disables the access, we should
not even look at the global one.

git-cvsserver.perl |    8 +++-----
1 files changed, 3 insertions(+), 5 deletions(-)

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