webgl_materials_envmaps_exr: Fix (#24270)

examples/webgl_materials_envmaps_exr.html

@@ -66,8 +66,8 @@
 
 				let geometry = new THREE.TorusKnotGeometry( 18, 8, 150, 20 );
 				let material = new THREE.MeshStandardMaterial( {
-					metalness: params.roughness,
-					roughness: params.metalness,
+					metalness: params.metalness,
+					roughness: params.roughness,
 					envMapIntensity: 1.0
 				} );