Fix an issue that "Learn More" button was not showing up.

ActionDisabledByAdming dialog was not showing the "Learn More" button
when restriction is enforced by the device owner for
disallow_factory_reset.

Test: atest ActionDisabledLearnMoreButtonLauncherTest

Bug: 185248897

Change-Id: I835d3aa040bd3e554acc8340d47831a4c89c45de