Fix trace tests auto-generation. This moves the trace header inclusion to the cpp file so that the test itself doesn't need to look at the individual trace headers. This fixes an include directory dependency. Also removes the FBO change callback from the generated traces. Bug: angleproject:4845 Change-Id: I019f0d347a62a81b92bf32110572911111212689 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2314217 Reviewed-by: Cody Northrop <cnorthrop@google.com> Commit-Queue: Jamie Madill <jmadill@chromium.org>