validator: inner polygon of multipolygon relation is reported as untagged way

[openstreetmap@…]

as the renderers no longer require to set the inner polygon with the same tags as the outer polygon, inner polygons could now may have no tags (except being part of a multipolygon relation)

the validators currently sets a warning for those polygons.

• instead the validator should check if the way is inner part of a multipolygon relation and not reporting this as a warning.
  
• unclosed inner ways being part of a multipolygon area-like relation should be reported as unclosed way, despite not having an area-like tag.

[anonymous]

Fixed in revision 12890.