GLTFLoader Extension Example: Fix Spotlight

examples/webgl_loader_gltf_extensions.html

@@ -211,6 +211,7 @@
 					spot1.position.set( 10, 20, 10 );
 					spot1.angle = 0.25;
 					spot1.penumbra = 0.75;
+					spot1.decay = 0.0001;
 
 					if ( sceneInfo.shadows ) {