Remove spaces from domain input

Checklist

• Have you pulled and found the error with jc21/nginx-proxy-manager:latest docker image?
  • Yes / No
• Are you sure you're not using someone else's docker image?
  • Yes / No
• Have you searched for similar issues (both open and closed)?
  • Yes / No

Describe the bug
When entering a new host on npm, ex. a domain or an ip, should you put a space before or after said host, it wont load at all and throw a 502 which is highly misleading (as its not related to upstream not responding).
The browser will forcefully remove every space on the domain/hostname so the browser guesses right.
It's about following the standard and avoiding confusion as someone would instinctively go check for upstream/docker errors.

A javascript check to remove spaces is presumably enough in my opinion.

Nginx Proxy Manager Version
latest (as per rn)
v2.15.1

To Reproduce
Steps to reproduce the behavior:
As mentioned above.

Expected behavior
502 Error.

Reproduce the issue by entering leading or trailing spaces in a new host's domain or IP field, then trace the frontend validation for that input. Confirm the intended behavior with the issue's description and verify that the entered host no longer causes a misleading 502 response.