CORE-568: In Core Crypto, in System.updateNetworFee don't use 'tier'
CORE-568: In Core Crypto, in System.updateNetworFee don't use 'tier'

breadwallet/breadwallet-core,breadwallet/breadwallet-core,breadwallet/breadwallet-core,breadwallet/breadwallet-core,breadwallet/breadwallet-core,breadwallet/breadwallet-core