bugfix: issue-17: read correctly 0deg yaw angle for certified aero device

VectoCore/VectoCore/InputData/FileIO/XML/Declaration/DataProvider/XMLDeclarationVehicleDataProvider.cs

@@ -1122,8 +1122,7 @@ namespace TUGraz.VectoCore.InputData.FileIO.XML.Declaration.DataProvider
 			{
 				get
 				{
-					var nodes = this.GetNodes(XMLNames.Trailer_YawAngle0);
-					return GetNodes(XMLNames.Trailer_CertifiedAeroReduction).Count > 0 ? GetDouble(XMLNames.Trailer_YawAngle0) : 0;
+					return GetNodes(XMLNames.Trailer_YawAngle0).Count > 0 ? GetDouble(XMLNames.Trailer_YawAngle0) : 0;
 				}
 			}