pw_rpc: Remove unused GN args
pw_rpc: Remove unused GN args

The pw_transfer integration tests were moved into Bazel, so these GN
args are unused.

Change-Id: Id748392779df339d68affb7568b03ba6d8d2fc4c
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/118635
Reviewed-by: Armando Montanez <97ef6fdb231c129ac8827d9f0c4106bfbf57f74f@google.com>
Commit-Queue: Wyatt Hepler <cca3bedb37979eacd157a9bceb473582df8aea1e@google.com>
Pigweed-Auto-Submit: Wyatt Hepler <cca3bedb37979eacd157a9bceb473582df8aea1e@google.com>

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