LockSettingsService: remove redundant calls to verifyChallenge() am: 0ca264698e am: 88793a8382 am: 4d1d52bc4d

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2775371

Change-Id: Iea947ad8f9d188520afa31ff179a9cd684d47676
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>