[heycam/webidl] readonly attribute setter synthesis should happen for LenientSetter, not LenientThis (#271)

The spec says, at <https://heycam.github.io/webidl/#dfn-attribute-setter>:

> If attribute is read only and does not have a [LenientThis], [PutForwards] or [Replaceable] extended attribute, return undefined; there is no attribute setter function.

That should be [LenientSetter], not [LenientThis].

@domenic, @tobie 

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