Add CLI flag to show encrypted balance

[osuketh]

When users get their balances, encrypted balance and pending_transfer are printed out by default. It seems messy, so add cli flags to print out these value. https://github.com/LayerXcom/zero-chain/blob/1fc625f714442dba590d0dac95e78bf4b2a49392/zface/src/main.rs#L275-L277