Template texture generation broken when project format is per face, but cubes are box uv.

[ewanhowell5195]

• Create a new project.
• Set the project UV mode to per face UV.
• Create a cube.
• Set the cubes UV mode to box UV.
• Create a new template texture (leave box UV unticked)
• Generated template is broken

[JannisX11]

Duplicate of #1817