Fix hash marks

[kfarr]

to complete

• - revert bus segment to previous behavior
• - fix repeat count for other divider cases

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[kfarr]

Possible implementation methods:

1. replace the existing divider surface with the new design and superimpose the existing road surface behind it -- easier but adding another texture and naive method will change angle of hash
2. new logic -- if a variant is "divider" and the ground mixin id has not been changed to elevated grass or sidewalk, then use default drive-lane mixin for segment texture and add repeating hash like other stencils

[kfarr]

progress using method 1

[kfarr]

before: 80kb (53+27kb) for hatched and hatched normals
now: 42kb just for seamless-lane-with-hatch-half.jpg (saving ~40kb)