[nearby] Fix flakeness in the unit test am: df7db9c554 am: 5763fe8e14

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2871063

Change-Id: I61c306dbba344c7f3e411b50374bcb73519e6422
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>