crop=grape on landuse=vineyard is unnecessary

[dafadllyn]

iD complains that "vineyard has incomplete tags" if it is tagged landuse=vineyard and suggest to add crop=grape. However, adding crop=grape to landuse=vineyard is completely unnecessary, as only grapes grow on vineyards (see also https://wiki.openstreetmap.org/wiki/Tag:landuse%3Dvineyard).