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

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

Change-Id: I589414ba6005a08b40dc7fb6c52a6ed04aa60dac
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>