Add default modules within rt.sh for Derecho

[FernandoAndrade-NOAA]

Description

Per #2863 (comment), there are no modules loaded if ecflow and rocoto are set to false during setup within rt.sh for Derecho. Default module loads should be introduced for Derecho.

To Reproduce:

Additional context

Output

[FernandoAndrade-NOAA]

@natalie-perlin @gspetro-NOAA @dpsarmie @jkbk2004 FYI