Esri World Imagery and World Imagery Clarity are showing same metadata

[bhousel]

We are supporting the both Esri World Imagery and Esri World Imagery (Clarity), but the "clarity" source is still querying the same metadata server, so we don't actually see the true values for imagery vintage, etc.
cc @jgravois

Code to fix is here:

iD/modules/renderer/background_source.js

Lines 292 to 293 in db0858f

	// build up query using the layer appropriate to the current zoom
	var url = 'https://services.arcgisonline.com/arcgis/rest/services/World_Imagery/MapServer/' + metadataLayer + '/query?returnGeometry=false&geometry=' + centerPoint + '&inSR=4326&geometryType=esriGeometryPoint&outFields=*&f=json&callback={callback}';