updated VertexData.CreateTiled() call to its new signature

src/Mesh/babylon.geometry.ts

@@ -733,7 +733,7 @@
             }
 
             public _regenerateVertexData(): VertexData {
-                return VertexData.CreateTiledGround(this.xmin, this.zmin, this.xmax, this.zmax, this.subdivisions, this.precision);
+                return VertexData.CreateTiledGround({xmin: this.xmin, zmin: this.zmin, xmax: this.xmax, zmax: this.zmax, subdivisions: this.subdivisions, precision: this.precision});
             }
 
             public copy(id: string): Geometry {