min/max port on proxy page

[lastsamurai26]

i think this issue is still aviable because i can set a minus port

(https://github.com/NginxProxyManager/nginx-proxy-manager/pull/3188)](https://github.com/NginxProxyManager/nginx-proxy-manager/pull/3188)

[github-actions]

Issue is now considered stale. If you want to keep it open, please comment 👍