Fill for unclassified miniroundabouts missing

[pnorman]

Mini-roundabout fill colours are defined in

openstreetmap-carto/style/roads.mss

Lines 3134 to 3140 in f066b0b

	[int_tc_type = 'primary'] { marker-fill: @primary-casing; }
	[int_tc_type = 'secondary'] { marker-fill: @secondary-casing; }
	[int_tc_type = 'tertiary'] { marker-fill: @primary-casing; }
	[int_tc_type = 'residential'] { marker-fill: @residential-casing; }
	[int_tc_type = 'living_street'] { marker-fill: @living-street-casing; }
	[int_tc_type = 'service'] { marker-fill: @service-casing; }
	[int_tc_type = 'track'] { marker-fill: @track-casing; }

This does not include highway=unclassified, resulting in a blue dot instead of one that matches the casing.

The node in question is https://www.openstreetmap.org/node/253329433, but a data change on osm.org means it no longer shows the problem.

[imagico]

Tertiary is wrong as well:

[imagico]

See also #4380 (comment)