Update OpenAI exports

Token calculation now works with CommonJS

src/platforms/openai/index.ts

@@ -3,7 +3,6 @@ import { Configuration } from './common';
 export * from './chat';
 export * from './models';
 export * from './common';
-// FIXME wasm module imports don't work with commojs
 export * from './usage';
 
 export { PlatformEventEmitter, PlatformEventEmitterImpl } from './events';