Fix incorrect window title.

Summary: The window title by default is set to "Protogame".  This overrides `LoadContent()` to set the window title to "Tychaia" when the game is running.

Test Plan: Build and run the game.  The window should be titled "Tychaia".

Reviewers: Sabre070

Reviewed By: Sabre070

Maniphest Tasks: T73

Differential Revision: http://code.redpointsoftware.com.au/D60