bisect-kit: fix bisection range

If the two ends of bisection range are snapshot versions, the candidate
indexes may be wrong.

BUG=None
TEST=manually

Change-Id: Ie1a894ed3b4bc0d6fe4aa4b367ca28f838936180
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/bisect-kit/+/3205500
Tested-by: Kuang-che Wu <kcwu@chromium.org>
Auto-Submit: Kuang-che Wu <kcwu@chromium.org>
Commit-Queue: Zheng-Jie Chang <zjchang@chromium.org>
Reviewed-by: Zheng-Jie Chang <zjchang@chromium.org>
1 file changed