Do not mark user_set on one-time

Feedback has told us that users expect the platform to treat one-time as
not a decision by the user. This means that selecting one-time in the
grant dialog or selecting Ask in settings will act as if the user never
made a decision after revocation.

Test: atest CtsPermission3TestCases
Bug: 151910236
Change-Id: I205d9259640d29c5c0bf73e1019654508606aa70