bisect-kit: clean up experiment version

BUG=b:328452015
TEST=./diagnose_cros_tast.py {init,run} && ./run_formatter.sh

Change-Id: I288d3fd014777794966a33f6ac49bc1631576645
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/bisect-kit/+/5348017
Reviewed-by: MD Nayeem Jahan Rafi <njrafi@chromium.org>
Commit-Queue: Cheng-Yu Lee <cylee@google.com>
Tested-by: Cheng-Yu Lee <cylee@google.com>
2 files changed