Examples: Fix argument passed to copyTextureToTexture (#28419)

examples/webgpu_materials_texture_partialupdate.html

@@ -110,7 +110,7 @@
 
 					// perform copy from src to dest texture to a random position
 
-					renderer.copyTextureToTexture( dataTexture, diffuseMap, new THREE.Vector2(), position );
+					renderer.copyTextureToTexture( dataTexture, diffuseMap, null, position );
 
 				}