fix: remove the return await

[xgqfrms]

async function no need to use await as the returned value

test cases

class Waiter {
  async wait() {
    return await Promise.resolve(1);
  }
}

new Waiter().wait().then(console.log);
// 1

class NewWaiter {
  async wait() {
    // no need `await` ✅
    return Promise.resolve(1);
  }
}

new NewWaiter().wait().then(console.log);
// 1

refs

https://javascript.info/async-await

[CLAassistant]

All committers have signed the CLA.