Use UNIX socket patch from url struct

[klemensn]

No need to extract it again when the url package provides it for us:

$ jq -n '{"AdminListen":"unix:///tmp/ygg.sock"}' | ./yggdrasil -useconf | grep 'admin socket'
2024/10/08 22:41:11 UNIX admin socket listening on /tmp/ygg.sock

Follow-up on #1176

[neilalexander]

Looks good at first glance but can you please just check this does the right thing when there are complex characters in the file path that may or may not be URL-encoded?

[klemensn]

Looks good at first glance but can you please just check this does the right thing when there are complex characters in the file path that may or may not be URL-encoded?

It now decodes URL encoded file paths, e.g. unix:///tmp/y%40gg.sock becomes /tmp/y%40gg.sock / /tmp/[email protected] with master / this PR, respectively.