Fix incorrect path in run_code_generation.py Adding missing "src". BUG=angleproject:2267 TEST=python scripts/run_code_generation.py Change-Id: I89d981c8f09e6d0839d0b796a2ea14a8466f98a7 Reviewed-on: https://chromium-review.googlesource.com/952925 Reviewed-by: Olli Etuaho <oetuaho@nvidia.com> Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>