Update (and break layer check for) external-controller example

[CraigMacomber]

Description

Tidy up example but breaks layer check.

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Latest commit: b7a14f3e7077f96b0c2bf6cf3ef7675991f944d0

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This PR has been automatically marked as stale because it has had no activity for 60 days. It will be closed if no further activity occurs within 8 days of this comment. Thank you for your contributions to Fluid Framework!