Update utObjImportExport.cpp

Remove unused header.

test/unit/utObjImportExport.cpp

@@ -47,7 +47,6 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <assimp/Importer.hpp>
 #include <assimp/Exporter.hpp>
 #include <assimp/postprocess.h>
-#include <code/Exceptional.h>
 
 using namespace Assimp;