Fix trpc device map

[bene-ges]

device_list is a dictionary, and we need to map to its values, not the keys.
Issue: #2002

[gitguardian]

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🔎 Detected hardcoded secret in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
9453265	Triggered	Generic High Entropy Secret	b0358f1	python/fedml/workflow/driver_example/main.py	View secret

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