roll: pigweed pw_bluetooth_proxy: Remove connection reuse log

Since the Acquire* API's all create a connection, this log entry was
always printing and not providing useful info. Change to only print on
initial create.

Fixes: 401603717
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/277493
Tests-Not-Needed: Austin Foxley <afoxley@google.com>
Original-Revision: 62025f5632afdf6b6e994a5ddc6ed881d26ad654

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 322d5ee57cf3b6..62025f5632afdf
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8719904851773363057
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I89cf0d408cd02fac34d7f3876dd7ed2de6c633c3
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/showcase/sense/+/277618
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>