LoopToMap Forgets to add symbols to nestedSDFG

[ThrudPrimrose]

This is more a TODO for myself to not forget.

Applying LoopToMap to this SDFG (_simpl) results in a nestedSDFG that does have the symbol in it.

saturation_calculation_par.sdfg.json

saturation_calculation_simpl.sdfg.json

To reproduce run LoopToMap on the _simpl SDFG.

[ThrudPrimrose]

After looptomap: