bisect-kit: fix mis-rebased code

BUG=None
TEST=None

Change-Id: I3bc8c2927019acc6faa1e111b1aca1b78dd97a12
Reviewed-on: https://chromium-review.googlesource.com/1118202
Commit-Ready: Kuang-che Wu <kcwu@chromium.org>
Tested-by: Kuang-che Wu <kcwu@chromium.org>
Reviewed-by: Chung-yih Wang <cywang@google.com>
diff --git a/bisect_kit/cli.py b/bisect_kit/cli.py
index 58690a8..ecfb420 100644
--- a/bisect_kit/cli.py
+++ b/bisect_kit/cli.py
@@ -507,7 +507,7 @@
           inited=True,
           old=self.states.idx2rev(left),
           new=self.states.idx2rev(right),
-          estimated_noise=','.join(estimated_noise),
+          estimated_noise=estimated_noise,
           done=self.strategy.is_done())
     else:
       result = dict(inited=False)