JJ: align these icons

[Chani]

someone adjusted the list thingy that the add-widgets and activity-manager UIs 
use so that it's prettier and shows the names on top. I like it :) but they 
missed something: the little icons that the activity manager draws on top 
(and, most likely, the corresponding click area for the stop button) haven't 
been shifted down to match the icon.

http://chani.ca/sshots/icon-over-text.png

anyone got time to fix that? :) everything just needs to be shifted down by 
however much the icon in the abstract class was shifted down.
Although it does seem a bit funny to have the close button in what isn't quite 
the top-right corner any more... so... if anyone wants to prettify that too 
I'll be very happy :)