bolt11: correctly parse all valid bolt11 hrps

[niftynei]

untested, please merge.

# Human-Readable Part

The human-readable part of a Lightning invoice consists of two sections:
1. `prefix`: `ln` + BIP-0173 currency prefix (e.g. `lnbc` for Bitcoin mainnet, `lntb` for Bitcoin testnet, `lntbs` for Bitcoin signet, and `lnbcrt` for Bitcoin regtest)

src: https://github.com/lightning/bolts/blob/master/11-payment-encoding.md#human-readable-part Reported-By: @pocolocosv

[lnbc1QWFyb24]

Thanks for this, so I guess me saying that Clams is network is agnostic was a bit of a lie lol 😆 Has been merged and will deploy automatically to our staging app soon. Planning on getting a prod release out today and will include this.

[niftynei]

works great now, thanks!!