Convert uses of lite button to H20 menu button

Lite has the same dimensions of the H18 menu button, which is unused
and moved to attic. Since all uses of lite were menus, I reassigned
them to use the current H20 menu image.
Fixed wrong macro arg name and missing quote
Removed 'lite' button images

If these need to be restored, the H18 menu images in
attic/spare_buttons will suffice