Edit BSQ swap offer

[ghost]

Fixes #6075
Made it possible to edit price.

Screenshots:

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[ripcurlx]

@xyzmaker123 As no fees are being paid for BSQ offers I think to edit a BSQ offer it causes less code changes if you just remove the old one and open a new create offer view with pre-populated fields similar as it is done when cloning an BSQ offer. But please wait with this until #6135 is merged as lot of code that you would touch is going to be changed.

[ghost]

@ripcurlx I rebased into master and resolved conflicts

just remove the old one and open a new create offer

I think it's not good approach:

• it would be not possible to cancel edit offer
• not consistent UI behavior in comparison with other offers edition

[ripcurlx]

As I don't remember anymore if there was a reason (besides that there are no fees paid, so no loss when deleting an offer) I'd like to have @chimp1984 opinion on this as well.

[chimp1984]

I do not remember any reason preventing that, but as you said as canceling an offer is without costs it was easier to cancel and re-create. I don't have time atm to review the changes. Its non trivial changes so should be reviewed with care.

[ghubstan]

I do recall @sqrrm saying he never intended to make swap offers editable because cancelling them is free.

If they become editable in UI, I will eventually need to make them editable in the API -- that is also a non-trivial change on both the CLI and server (daemon) side.