Icons for block_list blocks do not show up next to the items when using the items and icons array
It seems that the core blocks all simpy appened their icon to the text of the item
rather than using the icon array. Which is why it looks fine for any block that doesn't
use the icons array.
Example the course_list block leaves the icon field empty
The icon array is left empty and the icon is appeneded to the item itself.
So although course_list shows up normally any block that seperates out the
icons from the items will have it's icons above the items and not next to.
block_activity_modules does this as well