Update settingcontroller.php

[ruffraff]

Add service getOnlyOfficeServerUrl to read Document Server Url

[SergeyKorneyev]

Hi, could you explain what is the purpose of getting the Document Server's public address with this method?

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}