NLogRequestPostedBodyMiddleware - Fixed handling of Stream.Position

[snakefoot]

Fixed bug introduced with #958 + #933

System.NotSupportedException: Specified method is not supported.
   at Microsoft.AspNetCore.Server.IIS.Core.ReadOnlyStream.get_Position()
   at Microsoft.AspNetCore.Server.IIS.Core.WrappingStream.get_Position()
   at NLog.Web.NLogRequestPostedBodyMiddleware.ShouldCaptureRequestBody(HttpContext context)
   at NLog.Web.NLogRequestPostedBodyMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext ontext)
   at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext)
   at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, waggerProvider swaggerProvider)
   at Microsoft.AspNetCore.HttpLogging.HttpLoggingMiddleware.InvokeInternal(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

See also: https://stackoverflow.com/q/76610846/193178

[sonarqubecloud]

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