chore: delegate deposit/withdraw to xucli when currency is not btc/ltc

[reliveyy]

E.g.

• deposit eth -> walletdeposit eth
• withdraw 100 usdt <addr> <fee> -> walletwithdraw 100 usdt <addr> <fee>

[raladev]

• [ ] currency passing does not work

simnet > deposit btc
Not available on simnet
simnet > 
simnet > 
simnet > 
simnet > deposit BTC
xucli walletdeposit <currency>

Not enough non-option arguments: got 0, need at least 1
simnet > 
simnet > 
simnet > deposit eth
xucli walletdeposit <currency>

Not enough non-option arguments: got 0, need at least 1

[kilrau]

Please also review and merge https://github.com/ExchangeUnion/docs/pull/111 once this PR here is in @raladev