DateTimeOffsetAdapter::ToString unused parameter

Method DateTimeOffsetAdapter::ToString used for printing exception message at https://github.com/dotnet/runtime/blob/802bbbdb3232912c6343db7a31e50ed63a59dc46/src/libraries/System.Private.DataContractSerialization/src/System/Runtime/Serialization/DateTimeOffsetAdapter.cs#L67 takes always invariant culture value but uses current culture for the formatting of the result value.