control - fix bug in imageURL render format
control - fix bug in imageURL render format

The render format was setting bgcolor and passing that into makeImage,
but makeImage wants it as 'b'.  For consistency, b is now what imageURL
accepts/passes.

sportsworldchicago/app.sportsworldchicago.com---AnyCommerce-Development,CommerceRack/anycommerce,speedaddictcycles/speedaddictcycles,speedaddictcycles/speedaddictcycles,speedaddictcycles/speedaddictcycles,CommerceRack/anycommerce,sportsworldchicago/app.sportsworldchicago.com---AnyCommerce-Development,campuscolors/campuscolors,campuscolors/campuscolors,CommerceRack/anycommerce,campuscolors/campuscolors