gui: Restrict GUI listening ports to >1024, add help (fixes #4020)

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This adds a pattern validator to the GUI listen port field that checks
for port numbers 1024 and above. Also adds a help link pointing to the
(new) page talking about GUI listen port numbers. That page has
information on how to work around the restriction, in general terms.

Also changes the header from "GUI Listen Addresses" to the singular
version, because we only support one listen address today.

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4116

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