Aqua doesn't set asset id for L-BTC BIP21 in QR

[kilrau]

Two things:

• [ ] Aqua defaults to BIP21 in QRs for Receive -> USDT, but NOT in Receive -> L-BTC (here it's just the plain address). It should be BIP21 for both, even though no amount is set, Liquid is a multi-asset network and a plain address is not enough.
• [ ] For Liquid BIP21 asset type is mandatory and Aqua sets it in Receive -> USDT but NOT in Receive -> L-BTC when setting amounts, this is a clear violation of Liquid BIP21 where asset id is mandatory and causes other LIquid wallets like Green to error when scanning the QR.

[salvatoto]

Fixed in v0.1.51-bravo