[whatwg/webidl] ObservableArray's "set the length" algorithm is missing a return (Issue #1050)

AFAICS https://webidl.spec.whatwg.org/#observable-array-exotic-object-set-the-length needs to return a boolean, given it already returns `false` in one of the comparison steps.
It seems to be missing a `return true` at the end of the algorithm, be run when all steps have run successfully.

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https://github.com/whatwg/webidl/issues/1050