Remove account should show policy transparency dialog when DISALLOW_MODIFY_ACCOUNTS

is set.

createAdminIntentSupport always checks user restrictions on user 0(
if called from system uid) so can't be used here when account could
be work profile account.

Bug: 70674230
Test: m -j RunSettingsRobotests
Change-Id: Ibd2df8891d9fa7b4c85c42a305c5db2acd4c829b