[Dillo-dev] [patch]: fix the download GUI resize bug

There's a bug in the downloads GUI that stops the download items resizing when the window does. The resizable of the window should be the scrollgroup, not the packedgroup. Fixing this means we don't need to explicitly resize the scrollgroup after removing an item (because the window has already resized it) so I took that out. Patch attached. Regards, Jeremy Henty