avoid await at top level

[URenko]

await at top level seems not be allowed in some old browser (Andoird webview in my case).
By using then instead, we can enhance compatibility without any loss.

[Difegue]

The android webview doesn't support await, but front-end ES6 module loading works? ¯\_(ツ)_/¯

Looks good to me if it helps you tho, I'll run some quick testing then merge this.

[URenko]

It is not await itself now work, but "await at top level".
It may relate to second item in https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/await#browser_compatibility

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