Images flipped when rendering on built-in geometry

[guusw]

Recently found out that if you LoadImage into a Texture and then render on top of a built in Plane or Cube, the texture is mapped upside down. Need to figure out where it's flipped, could be either texture coordinates or during image=>texture loading.

I commited a change recently that flips on load but then UI images will be upside down, so will revert that.