Update regex to allow for whitespace before ln address

[secondl1ght]

Closes #520, this was my first time trying regex so I am not 100% sure that this is correct. If it is wrong please let me know and I will go back and learn more about regex.

[bumi]

here are some tools to inspect/debug regex:
https://www.debuggex.com/
https://rubular.com/

I think I'd do something like: (⚡️:?|lightning:|lnurl:)\s?(\S+@\S+) to not have the whitespace part of the match group and only have the lightning address in there.

and I think there are some more places where this is used. can you look for them also

[bumi]

and don't forget to look for other occurrences of the regex