pw_kvs: Restore implicitly deleted constructor No-Docs-Update-Reason: Compiler update bugfix Change-Id: I83e0b108d01040a93b26bf695acbd183c65f2462 Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/47540 Pigweed-Auto-Submit: Armando Montanez <amontanez@google.com> Reviewed-by: Ewout van Bekkum <ewout@google.com> Commit-Queue: Armando Montanez <amontanez@google.com>
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