Fix incorrect password attempts messaging on headless

Bug: 257276847
Test: manual testing: provisioned a headless device to single_user DO
mode, set a max attempts for wipe policy, set a pin on the device,
attempted an incorrect pin and verified the warning message is for
wiping the device rather than removing the user.
Flag: ACONFIG android.app.admin.flags.headless_single_user_fixes DISABLED

Change-Id: I6bea908c898c05bcd98ec2d8e8b0fb52f4287ed6