When setting cursor to show, cursor isn't rendered in the viewport until the mouse is moved

When changing the cursor to show after being hidden, the cursor will not reappear until the mouse is moved.

1. Create a simple widget and add it to viewport
2. Set input mode to Game and UI
3. Bind the left mouse to set 'Show Mouse Cursor' to false on mouse down and true on mouse up
4. Click the mouse in game
5. Cursor does not reappear until the mouse is moved again