CtsVerifier: restore FingerprintBoundKeysTest leeway

Add 1 second of additional leeway to the check that a fingerprint bound
key should stop being usable at an interval after activation.

This was accidentally removed in aosp/2971097 and makes the test overly
twitchy.

Bug: 334927001
Test: CtsVerifier
Change-Id: I6a9d0681af607257c46efd3a67abbabc883c1518