[Dashboard] Remove spurious conditional
[Dashboard] Remove spurious conditional

Due to some churn when switching sparse diagnostics from by-type to by-name,
we have the same conditional repeated twice in add_histograms.py.

This CL cleans up the second instance of the conditional, so that everything
will just be executed under the first 'if' block.

Change-Id: I813bd0ef86d5a76744a6f97ba23275962db895cd
Reviewed-on: https://chromium-review.googlesource.com/801214
Reviewed-by: Simon Hatch <490a224d89645d3fea983d7189ce51bde0a00c1d@chromium.org>
Commit-Queue: Simon Hatch <490a224d89645d3fea983d7189ce51bde0a00c1d@chromium.org>

catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult