consider deleting dead code

[matkoniecz]

At the end of style

#    transit-bus-roads:
#        data: { source: mapzen, layer: roads }
#        filter:
#            all:
#                - is_bus_route: true
#                - function() { return global.sdk_transit_overlay; }
#        draw:
#            lines:
#                interactive: false
#                color: [[13,[0,0,1,0.5]],[15,blue]]
#                width: [[11,0.5px],[12,0.8px],[16,1.25px],[18,1m]]
#                # let roads sort themselves past zoom 14
#                order: 488
#                # but give them all the same outline
#                outline:
#                    order: 487

is present. I think that this code should be deleted (history is handled by git history, ongoing implementation probably should be handled in an issue/pull request).