let the browser handle enter key input by presenting an html form

[mjadach-iv]

Generally it would be best to let the browser handle enter key input by presenting an html form and handling the submit event.
But I understand that this might be a tough refactor so I just want to raise awareness for the issue.

I would be happy if the enter key starts working on all input modals, e.g. fund channel and so on.. :)

Originally posted by @esterlus in #675 (comment)