[rfc][icedtea-web] BasicExceptionDialog centered on screen

[Omair Majid]

Hi Andrew,

* Andrew Azores <aazores at redhat.com> [2013-11-12 14:57]:
> Our basic exception dialog doesn't seem to center itself on screen,
> which is a little sad IMO! It's just a one-line patch.

Looks good to me.

Cheers,
Omari