Skip <del> tags when counting number of AO parameters

[ptomato]

The parameter counter doesn't handle markup like this very well:

https://github.com/tc39/proposal-temporal/pull/2245/files#diff-cd62efd2602bdd5c2e435179e40c5d2daa5db198c9ac6324a6f8cf1c41a89873R73-R82

It thinks the AO should be called with 4 or 5 parameters, whereas it should be 3 or 4. One of the parameters is inside a <del> tag, hence the discrepancy.

[ptomato]

(A likely-looking workaround is <del>_excludedItems_</del><ins>_excludedKeys_</ins>: a List of property keys,, or _excluded<del>Items</del><ins>Keys</ins>_: ..., but neither of those are accepted by the structured header parser.)

[bakkot]

Thanks for the report; should be fixed by #492, which I'll publish once it gets through CI.

[bakkot]

Fixed in 15.0.1.