refactor set pin
refactor set pin

litecoin-foundation/loafwallet-android,dr0pthedoge/unitwallet-android,breadwallet/breadwallet-android,breadwallet/breadwallet-android,breadwallet/breadwallet-android,dr0pthedoge/unitwallet-android,litecoin-foundation/loafwallet-android,breadwallet/breadwallet-android