Floating-point leftovers: lib_rend/lib_rend_fx.c, makeCustomLsSetup()
# Bug description
In the function `makeCustomLsSetup()` there is floating-point code left, namely:
* fabsf()
* EPSILON
* rendCustomLsLayout.elevation\[\]
```
IF( fabsf( rendCustomLsLayout.elevation[i] ) > EPSILON )
{
customLs.is_planar_setup = 0;
move16();
BREAK;
}
```
Also, instead of `rendCustomLsLayout.elevation[i] `the comparison should be made against `rendCustomLsLayout.elevation_fx[i]`
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issue