Removing requirement to restart game after applying changes to mouse focus option

I have removed the requirement for the game to be restarted after applying changes to the 'lock mouse to window' option in the 'Input' tab of the settings menu. I had to add a bit of plumbing between IGraphicsDevice and SettingsLogic to achieve this.
Empty lines like this is what I meant by excess whitespace, sorry I am not too good with words in the morning.