Tracing - Fix add_reserved_diagnostics.
Tracing - Fix add_reserved_diagnostics.

Refers to "result" which doesn't exist, just removed that.

Change-Id: I7c22fba86ccb4427d48b1208a497e711e6d0d480
Reviewed-on: https://chromium-review.googlesource.com/695863
Reviewed-by: Ben Hayden <d3ffe0e065c2328e497bb32a07f4dcb29138ef5b@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