Previously there were two places where we missed the xvfb script.
This was causing the replay to fail.

Bug: angleproject:6085
Change-Id: I833916fa0cdacc163ec2bdd08831249807f319c5
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2979353Reviewed-by: Cody Northrop <cnorthrop@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>