📢 Lightning devs - Let's get rid of the description_hash requirement in LNURL-pay

* achieves no goal but adds complexity

* LNURL for CLN without Rube Goldberg contraptions

* only wallets need to change, not Servers

* change is code removal, not addition

The original purpose of description_hash is to avoid MITM attacks - but it does not achieve that.

Furthermore, CLN in particular does not like invoices with only a description_hash - don't ask why, we've been trying to figure this out for over a year.

This PR finally gets rid of this requirement and we won't ever have to worry about CLN turning on an off description hash support.

Fiatjaf agrees - (joke's on me: I supported Drivechain before but apparently he didn't know (end sarcasm)).