flip TextureData loaded from LodePNG

src/ACGL/OpenGL/Data/TextureDataLoadStore.cc

@@ -237,6 +237,9 @@ SharedTextureData loadTextureDataFromLodepng(const std::string &_filename)
     data->setType(glType);
     data->setFormat(glFormat);
 
+    // Flip
+    data->flipVertically();
+
     return data;
 }