[MiNT] XaAES: Bad form_alert() icons

[Vincent Rivière <vincent.riviere@freesbee.fr>]

Hello.

Apologies if this bug has already been reported.

I use ARAnyM and an EasyMiNT setup upgraded to FreeMiNT 1.17.
Globally, it works really fine.

The icons in form_alert() have wrong colors. For example, in TeraDesk, if I 
do File > Quit/Shutdow, the icon is black and blue, instead of being yellow 
and transparent.

--
Vincent Rivière