fix wms tilesize (#5958)
fix wms tilesize (#5958)

* fix wms tilesize as L.point

msiadak/Leaflet,stefanocudini/Leaflet,Leaflet/Leaflet,msiadak/Leaflet,CapeSepias/Leaflet,CapeSepias/Leaflet,CapeSepias/Leaflet,stefanocudini/Leaflet,stefanocudini/Leaflet,Leaflet/Leaflet,msiadak/Leaflet,Leaflet/Leaflet