tpview: getUnitTest: fix HardwareProperties

Lost some commas during a refactor.

BUG=chromium-os:31236
TEST=generate a unittest; copy to gestures code; build unittests
 => unittest compiles cleanly

Change-Id: Ie0bb6725d00d79e59e421c3f7cfd5988daebde6e
Reviewed-on: https://gerrit.chromium.org/gerrit/23536
Reviewed-by: Andrew de los Reyes <adlr@chromium.org>
Commit-Ready: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Tested-by: Daniel Kurtz <djkurtz@chromium.org>