Hanging on Hodl invoice

[santyr]

Payment splitting appears to hang when encountering a self-custodial LN addresses powered by ZEUS (Hodl invoice).

Example address: for testing: thetruthaddict@zeuspay.com

[dni]

hey, yeah! that is an issue, we should try to pay the invoices in background tasks

[dni]

https://github.com/lnbits/splitpayments/blob/main/tasks.py#L72

its just a sync for loop inside a background task

[dni]

fixed #25