AudioFlinger: Ensure RecordTrack dtor called outside lock (pt 2)

        // loop over each active track

        for (size_t i = 0; i < size; i++) {

            if (activeTrack) {  // ensure track release is outside lock.

                oldActiveTracks.emplace_back(std::move(activeTrack));

            }

            activeTrack = activeTracks[i];

            // skip fast tracks, as those are handled directly by FastCapture