Fix the maximum port number in the SSH Manager plugin
It should be in the System Ports 0-1023 or User Ports 1024-49151 ranges.
See: https://en.wikipedia.org/wiki/Registered_port https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml
BUG: 441889 FIXED-IN: 21.12