Allow changing KRDP server settings when it's running
This change will allow changing the KRDP Server settings while it's running, and shows a restart button with a warning if user changes the settings during server run. The warning will show only after pressing apply.
The restart button will turn off the server over DBus, and then toggles it back on if everything goes correctly.
If user toggles the server off from the switch instead, it will also hide the warning.
Set milestone to 6.2 since this adds a new string.
BUG:489283