Add IsLockScreenDisabled to dump of LockSettingsService

Bug: 361730315
Flag: EXEMPT only affects bugreport content
Test: dumpsys lock_settings             # false
      locksettings set-disabled true
      dumpsys lock_settings             # true
      locksettings set-disabled false
      dumpsys lock_settings             # false
      locksettings set-pin 1234
      dumpsys lock_settings             # not shown
Change-Id: Ia6ee8ddde261f0bda45fd9f2a961a7ceeb967827