Changed which enum UnitType to use for NodeDisplacements

[TosteSkDa]

Changed what UnitType (LENGTH to DISP) was being used when pulling node displacements from GSA to fix bug where results were pulled in mm instead of m.

NOTE: Depends on

Issues addressed by this PR

Closes #289

Test files

https://burohappold.sharepoint.com/:f:/r/sites/BHoM/02_Current/12_Scripts/02_Pull%20Request/BHoM/GSA_Toolkit/%23290-read-node-displacements-gives-wrong-unit?csf=1&web=1&e=BJnL5s

Changelog

Additional comments

[johannaisak]

Works as expected and code changes look good :)

[IsakNaslundBh]

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