Fix quick perf test setting that was accidentally inverted.

Bug was introduced in
https://codereview.webrtc.org/2717973005/
Only affects test output, so omitting bug.

BUG=None

Review-Url: https://codereview.webrtc.org/2723093002
Cr-Original-Commit-Position: refs/heads/master@{#16943}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: e5d3a3ea78fde6f1557bdc5db3c457735d11b0b1