`ol.tilegrid.WMTS.createFromCapabilitiesMatrixSet` fails when tileMatrix identifiers are not prefixed by their tileMatrixSet identifier. Original code by @filipheymans
`ol.tilegrid.WMTS.createFromCapabilitiesMatrixSet` fails when tileMatrix identifiers are not prefixed by their tileMatrixSet identifier. Original code by @filipheymans