WinHttpHandler reports the wrong error message for large headers

[MihaZupan]

runtime/src/libraries/System.Net.Http.WinHttpHandler/src/System/Net/Http/WinHttpHandler.cs

Lines 772 to 780 in 19a01d0

	int lastError = Marshal.GetLastWin32Error();
	if (lastError == Interop.WinHttp.ERROR_INVALID_PARAMETER)
	{
	throw new FormatException(SR.net_http_invalid_header_value);
	}
	else
	{
	throw WinHttpException.CreateExceptionUsingError(lastError, nameof(Interop.WinHttp.WinHttpAddRequestHeaders));
	}

runtime/src/libraries/System.Net.Http.WinHttpHandler/src/Resources/Strings.resx

Lines 138 to 140 in 19a01d0

	<data name="net_http_invalid_header_value" xml:space="preserve">
	<value>Request headers must be valid Latin-1 characters.</value>
	</data>

Looks like ERROR_INVALID_PARAMETER is thrown in more cases than just non-Latin-1, e.g. sending a header name/value longer than 64 KB.
The error is also reported for a subset of [128-159] (except 129, 141, 143, 144, 157).

Simple fix here might be to just not throw a specialized exception.

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