Disable End Portal Parallax by default

[IcarussOne]

This was done because this tweak breaks certain shaders by default and it is quite reactive to fog as talked about on this issue here. Disabling this tweak by default will negate complaints.

[what-the-diff]

PR Summary

• Disabling End Portal Parallax
  The change in the UTConfigTweaks.java file disables an effect known as 'Parallax' for the End Portal. This effect can create an illusion of depth, but can also affect performance. Turning this setting off may improve the game performance, especially for lower-end devices.