bisect--helper: log: allow arbitrary number of arguments

bisect--helper: log: allow arbitrary number of arguments

In a later change, we would like to turn bisect into a builtin by
renaming bisect--helper.

However, there's an oddity that "git bisect log" accepts any number of
arguments and it will just ignore them all.

Let's prepare for the next step by ignoring any arguments passed to
"git bisect--helper log"

Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
Signed-off-by: Taylor Blau <me@ttaylorr.com>