Fix extra -- when not using the bazel command line.
Fix extra -- when not using the bazel command line.

PiperOrigin-RevId: 186781401

alexgorban/models,tombstone/models,jiaphuan/models,derekjchow/models,jiaphuan/models,jiaphuan/models,tombstone/models,alexgorban/models,tombstone/models,derekjchow/models,tombstone/models,derekjchow/models,cshallue/models,alexgorban/models,cshallue/models,jiaphuan/models,alexgorban/models,alexgorban/models,cshallue/models,cshallue/models,jiaphuan/models,jiaphuan/models,tombstone/models,derekjchow/models,tombstone/models,cshallue/models,derekjchow/models