Offline: fill in protomaps' "other" road-kind color (unset before,
so tracks/paths silently fell back to plain white against the cream
background); also fixes a dead "minor" theme key that was never read
by the actual paint expression (only minor_a/minor_b is), so ordinary
streets were quietly using the base theme's default yellow instead of
this app's cream.
Online: Liberty's own road_service_track layer merges paved service
roads with unpaved tracks into one color, which isn't safe to just
recolor brown (real driveways aren't unpaved). Clones it into a
second layer scoped to class=="track" only, dashed and dirt-brown,
matching the offline treatment without mislabeling paved service
roads.