[Sailfish UI] add placeholderText to server settings dialog fields
[systemd] checking enabled() is not reliable, always perform the state change
[systemd] don't reload unit files after enabling/disabling a unit
[Sailfish UI] put settings applet into 'security' category

That's where loosely-related 'Developer mode' settings are.
Prevents random placement of the item on 'System settings' screen
Incremented version