Remove missing script from angle.gni test config.
Remove missing script from angle.gni test config.

Was from a subsequent CL. For some reason this was only picked up
on the ANGLE roll into Chrome.

Bug: angleproject:3162
Change-Id: I6c9d4ab3843bd5a58a6695b79648b57343689c4d
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2236759
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Reviewed-by: Cody Northrop <94770d7fe1cce6ea0791fa9927c1107de4d2e37b@google.com>
Commit-Queue: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>

ppy/angle,ppy/angle,ppy/angle,ppy/angle