Examples: Restore look of particle snow demo. (#28799)

examples/webgpu_compute_particles_snow.html

@@ -298,7 +298,7 @@
 				const vignet = viewportTopLeft.distance( .5 ).mul( 1.35 ).clamp().oneMinus();
 
 				const teapotTreePass = pass( teapotTree, camera ).getTextureNode();
-				const teapotTreePassBlurred = teapotTreePass.gaussianBlur( 3 );
+				const teapotTreePassBlurred = teapotTreePass.gaussianBlur( vec2( 1 ), 3 );
 				teapotTreePassBlurred.resolution = new THREE.Vector2( .2, .2 );
 
 				const scenePassColorBlurred = scenePassColor.gaussianBlur();