Adding --private to addInvoice RPC call

[TKone7]

Hey there
I installed NWC next and connected it to my Alby account. So far so good, amazing job 🎉

At the moment I only have one private channel. If I then use my Alby Lightning Address to resolve an invoice it does not contain route hints. That invoice will be useless because no one in the network will find a route to my private node.

Would it make sense to include the --private parameter to the addInvoice RPC call to include route hints per default? I have seen that this used to be enabled by default by lnd, but then removed because of privacy considerations. Now one has to actively opt-in to include route hints.

Alternatively, the flag could be set only if all channels are private.