KFileWidget - confirmOverwrite default

[Maksim Orlovich]

> Why is it false by default ? (kfilewidget.cpp:97)
>
> I think this should be true by default so the user of the dialog hasn't got
> to worry about this. I also think that the strange case is that one that
> want to treat this case on its own.

It's fairly recently added functionality, and most apps do it themselves 
already, so changing it would cause existing apps to ask twice.

-Maks