pw_transfer: Skip stale windows in Python client
pw_transfer: Skip stale windows in Python client

Stop transferring requested packets if a new transfer parameters update
arrives.

Change-Id: Id8f5ef1b372e9d1407c4f70d05b8ce7b57c8b4e7
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/63293
Commit-Queue: Auto-Submit <14637eda5603879df170705285bf30f5996692f0@pigweed.google.com.iam.gserviceaccount.com>
Pigweed-Auto-Submit: Wyatt Hepler <cca3bedb37979eacd157a9bceb473582df8aea1e@google.com>
Reviewed-by: Keir Mierle <69344103cc60b36d6e1fbdc31ce6504b2286c646@google.com>

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