fix: better optimization of await expressions

[Rich-Harris]

a small fix that will be helpful in some upcoming work. If you have something like this...

{await x(async () => await y)}

...then today we generate this...

$.template_effect(($0) => $.set_text(text, $0), void 0, [async () => await x(async () => await y)]);

...when in fact we only need this, because the inner await is inside a function boundary:

$.template_effect(($0) => $.set_text(text, $0), void 0, [() => x(async () => await y)]);

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Latest commit: d178106

The changes in this PR will be included in the next version bump.

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