Warn about much likely wrong direction tag on highway=mini_roundabout

[Klumbumbus]

The direction of roundabouts and mini roundabouts is implizit based on driving side. Also I checked mini roundabouts with direction clockwise in right-hand-traffic and vice versa and found only tarrig errors (based on aerial imagery).
Even the ​magic roundabout, which has clockwise and anticlockwise directions doesn't need direction tags, because the small outer mini roundabouts are clockwise (default for great britan) and the inner running anticlockwise isn't even a roundabout but a junction=circular.

[Klumbumbus]

Hm. Maybe better not warn about correct explizit direction tags. I don't find it very useful but the wiki says you can add them.

[Klumbumbus]

In 16993/josm:

fix #19742 - Warn about much likely wrong direction tag on highway=mini_roundabout, remove icon for solely direction=clockwise tag

[Klumbumbus]

Possible additional rule for unnecessary.mapcss:

/* #19742 */
node!:righthandtraffic[highway=mini_roundabout][direction=clockwise],
node:righthandtraffic[highway=mini_roundabout][direction=anticlockwise] {
  throwWarning: tr("{0} is unnecessary for {1}", "{2.tag}", "{1.tag}");
  group: tr("unnecessary tag");
  fixRemove: "{2.key}";
}