Scene is brighter than it should

[CMDR-JohnAlex]

If you change the background colour to 0.2f, 0.3f, 0.3f, 1.0f or if you load a model you can tell that the world is very.. bright?

For example, here is what the scene should look like with a model:

Yet this is what it actually looks like with the same background colour and model:

We need to test if this is an issue on Linux and Mac builds.

[Piras314]

@CMDR-JohnAlex reproduces on linux