The prior script was incorrectly comparing a boolean result with a
number and producing the opposite result: True would be reported as a
failure, and False would be reported as success.

Bug: angleproject:4090
Bug: b/168049670
Change-Id: I47ec684a57c455c6a833232d0a49774b265f7b39
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2430667Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>