[SimWF] Recompute number of workers used in TFs

[benedikt-voelkel]

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[benedikt-voelkel]

@sawenzel note that at the moment, the argument that is passed with -j <workers> has no effect at this point.
Of course, what we can do is to simply take it if provided by the user and do not re-compute the number of workers in such cases.
However, that brings some complication that at the moment we set the number of workers usually in anchorMC.sh.
What we could do is to remove it there, so that always the default value of 8 can be taken for anchored (GRID) MCs.

Or we take the setting of the user when --pregenCollContext is not set. But as soon as --pregenCollContext is used, we do it as a function of IR like done here.

[benedikt-voelkel]

Actually I just adapted the logic according to my precious comment: The re-computation of the number of workers is only done if --pregenCollContext is set. Otherwise, up to the user to choose