Fixed a truncation bug for `list_user_policies`.
Fixed a truncation bug for `list_user_policies`.

spulec/moto,william-richard/moto,william-richard/moto,whummer/moto,spulec/moto,william-richard/moto,spulec/moto,whummer/moto,spulec/moto,spulec/moto,whummer/moto,whummer/moto,whummer/moto,spulec/moto,william-richard/moto,william-richard/moto,whummer/moto,william-richard/moto