Resolve "Migrate code to OTB 8.x"

Closes #5 (closed)

app/otbDEMProjection.cxx

 /*
- * Copyright (C) 2005-2021 Centre National d'Etudes Spatiales (CNES)
+ * Copyright (C) 2005-2023 Centre National d'Etudes Spatiales (CNES)
  *
  * This file is part of Orfeo Toolbox
  *
@@ -100,7 +100,7 @@ private:
   void DoUpdateParameters() override
   {
     // Clear and reset the DEM Handler
-#if defined(DRAFT_OTB8) || OTB_VERSION_MAJOR >= 8
+#if OTB_VERSION_MAJOR >= 8
     // TODO: private function... can't be cleared
     otb::DEMHandler::GetInstance().ClearElevationParameters();
     // otb::DEMHandler::GetInstance().ClearDEMs();
@@ -116,7 +116,7 @@ private:
     auto* inputImage = GetParameterImage("ref");
     auto generator = XYZToImageGeneratorType::New();
 
-// #if defined(DRAFT_OTB8) || OTB_VERSION_MAJOR >= 8
+// #if OTB_VERSION_MAJOR >= 8
 // #else
     generator->SetOutputParametersFromImage(inputImage);
 // #endif