Remove device from background list when initiating disconnect am: 44f711fa am: fcd3742d

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/2117841



Change-Id: I96f049a778b86d4ce11747965dd17f185a8b5748
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>