Remove input validation on services "external url"

[Cereal916]

Description

As a docker user, I have all of my arr containers on the same docker network so they can talk to each other and use their docker container name as the host name. Each of these apps have port binding which means the port they use to talk to each other is different from the port I use to access them. I'd love to set my internal address in the "external url" field so when I click links like "open in radarr" it will use the right port for me. Currently if I try to input http://homeserver:8911 I get an error message and cannot save.

Desired Behavior

Allow users to save server:port addresses to the "external url" field.

Additional Context

No response

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