rollback change to ES entrypoint, because Rollup didn't understand that it needed to locate the asset and include in output.

Author: Birch-san

box2d-wasm/dist/es/entry.js

@@ -22,8 +22,8 @@ export default async (...args) => {
   /** @type {{ 'default': import('box2d-wasm') }} */
   const Box2DModule = await (
     hasSIMD
-      ? import(new URL('Box2D.simd.js', import.meta.url))
-      : import(new URL('Box2D.js', import.meta.url))
+      ? import('./Box2D.simd.js')
+      : import('./Box2D.js')
   );
   const { 'default': Box2DFactory } = Box2DModule;
   // awaiting gives us a better stack trace (at the cost of an extra microtask)