Render mini-roudabout just like a turning circle

[hiddewie]

Fixes #4167

Changes proposed in this pull request:

• Make mini_roundabout be rendered exactly like a turning circle
• Includes secondary and primary roads in the SQL query for turning circles.

The icon is still rendered. It can be removed, or changed to a single dot in the casing color of the road which contains the roundabout.

Test rendering with links to the example places: https://www.openstreetmap.org/#map=19/49.15015/7.77923&layers=N

Before/after renderings (zoom is shown in image):

[imagico]

In principle a good idea. But you are not actually fixing #4167 this way because you keep rendering the mini roundabout symbol as a blocking symbol:

openstreetmap-carto/style/amenity-points.mss

Line 1486 in b10aef3

[feature = 'highway_mini_roundabout'][zoom >= 17]::highway {

I would suggest to follow the suggestion by @jeisenbe - continue rendering the center symbol, possibly in a less heavy variant (and possibly in casing color of the road) but without it blocking other symbols or labels.

[hiddewie]

@imagico Done. It is now a mini-dot in the middle of the roundabout. Not a blocking icon anymore.

That styling only applies to the mini_roundabout, not the turning-circles.

The color is matching the casing of the road that contains the roundabout.

Screenshots have been updated. Notice the zoom 19 screenshot that has a highway label which is not blocked by the roundabout.

[polarbearing]

Looks nice in the examples above, thanks.
Do we have any test rendering for lower roads, such as tertiary and residential, where mini roundabouts are more frequent?