Update webgpu_struct_drawindirect.html

Fix links.

examples/webgpu_struct_drawindirect.html

@@ -15,9 +15,9 @@
 		<script type="importmap">
 			{
 				"imports": {
-					"three": "../src/three.webgpu.js",
-					"three/webgpu": "../src/three.webgpu.js",
-					"three/tsl": "../src/three.tsl.js",
+					"three": "../build/three.webgpu.js",
+					"three/webgpu": "../build/three.webgpu.js",
+					"three/tsl": "../build/three.tsl.js",
 					"three/addons/": "./jsm/"
 				}
 			}
@@ -265,4 +265,4 @@
 		</script>
 
 	</body>
-</html>
+</html>