Misc fixes for the demo app.

[pytorchbot]

Summary: .

Differential Revision: D64119638

[pytorch-bot]

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❌ 2 New Failures

As of commit 86320e0 with merge base eecf74f ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
  ##[error]No files were found with the provided path: /home/ec2-user/actions-runner/_work/_temp/artifacts/. No artifacts will be uploaded.
• pull / unittest-arm (buck2) / linux-job (gh)
  ../../dev/misc/test_debug_feats.py::TestCollateTosaTests::test_collate_tosa_BI_tests

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[dvorjackz]

Do we need the change in text_token_generator.h?

[shoumikhin]

@d4l3k yes, it's needed to interrupt generation from UI in demo apps. Otherwise next time it tries to generate anything the token generator is already in a stopped state.