Don't expand name of ctor default arg #23478
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Fixes #23477
The primary constructor is private, so that the default arg is private in the companion module.
Default arg access must be widened because it is used from the auxiliary constructor.
Normally, this requires mangling the member name. Since the mangling was not encoded correctly, it can just use the existing name with the standard encoding (which ensures no conflicts; constructors are not inherited and overloads cannot both define defaults).