Save config immediately after setting last opened capture filename
Save config immediately after setting last opened capture filename

* This means that even if we crash while opening the capture it's set
  for the crash reporter to pick up.

baldurk/renderdoc,baldurk/renderdoc,etnlGD/renderdoc,michaelrgb/renderdoc,baldurk/renderdoc,baldurk/renderdoc,googlestadia/renderdoc,googlestadia/renderdoc,TurtleRockStudios/renderdoc_public,Zorro666/renderdoc,TurtleRockStudios/renderdoc_public,michaelrgb/renderdoc,etnlGD/renderdoc,michaelrgb/renderdoc,etnlGD/renderdoc,TurtleRockStudios/renderdoc_public,michaelrgb/renderdoc,etnlGD/renderdoc,TurtleRockStudios/renderdoc_public,etnlGD/renderdoc,Zorro666/renderdoc,googlestadia/renderdoc,Zorro666/renderdoc,TurtleRockStudios/renderdoc_public,baldurk/renderdoc,michaelrgb/renderdoc,Zorro666/renderdoc,googlestadia/renderdoc,Zorro666/renderdoc,etnlGD/renderdoc,Zorro666/renderdoc,baldurk/renderdoc,googlestadia/renderdoc,TurtleRockStudios/renderdoc_public,googlestadia/renderdoc