UI : minor : About screen does not dismiss

“About Scrivener” dialogue does not go away until you switch to another application and come back.

Confirmed and fixed for beta 2.

Is it too late to make it so that it does not automatically disappear when switching applications? We are all on the same page now, but in the future, bug reporting is often easier if you can reference the precise build number.

Removing code? Now that I do like. Done.