[telemetry] Relax timing check in wait_unittest.testWaitAction.
[telemetry] Relax timing check in wait_unittest.testWaitAction.

Its current check is inherently flaky, and we've seen failures on some bots.

BUG=None.
TEST=tools/telemetry/run_tests wait_unittest
R=tonyg@chromium.org

Review URL: https://codereview.chromium.org/61213007

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@235813 0039d316-1c4b-4281-b951-d872f2087c98

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