When changing https port a map is empty.

[Michał Rutka]

See https://forum.openremote.io/t/when-changing-manager-port-map-does-not-work-anymore/804

[Rich Turner]

This was actually an issue with the manager web server not correctly processing the X-Forwarded-Host header; I have made a minor update to the proxy config though as X-Forwarded-Port header was incorrect although this is a non-standard header and un-used in our manager.