[const.wrap.class] The deleted `operator,` overload has meaningless `constexpr` and `noexcept`

[frederick-vs-ja]

They don't seem to make sense for a deleted overload. Perhaps it's better to remove them (after merging the PR for P3978R3).

[eisenwave]

I don't think we have a strict guideline here, but it does seems silly to put noexcept on deleted functions.