Use the default message for unattended update scenario

Bug: 293580417
Test: verified manually
  1. Enroll face/fingerprint/trust agent
  2. Run adb root
  3. Unlock the device and run `adb shell cmd recovery request-lskf ota`
  4. Lock the device and it should show `For additional security, use pattern/pin/pattern instead`
Change-Id: If7212ab6aae1b9b66ef0427123e899fba8d4bff1