Fix debugger tests. (#2489)

Summary:
Debugger tests were failing because the `export` script was generating compiled models. Fixes the issue by making sure that the `compile` arg defaults to `false`.

Pull Request resolved: https://github.com/pytorch/executorch/pull/2489

Reviewed By: mcr229

Differential Revision: D55028099

Pulled By: shoumikhin

fbshipit-source-id: ba304c90a18b52993aac60a113b90ab63c917e53