Fix ReadPointDisplacementLoad

[GCRA101]

Issues addressed by this PR

Closes #472

Now pull of point displacement loads works as expected

Test files

Grasshopper File
https://burohappold.sharepoint.com/:u:/r/sites/BHoM/02_Current/12_Scripts/02_Pull%20Request/BHoM/ETABS_Toolkit/%23473-FixGetPointDispLoad/Test%20Script.gh?csf=1&web=1&e=5uSdY4
ETABS File
https://burohappold.sharepoint.com/:u:/r/sites/BHoM/02_Current/12_Scripts/02_Pull%20Request/BHoM/ETABS_Toolkit/%23473-FixGetPointDispLoad/Test%20Etabs%20Model.EDB?csf=1&web=1&e=aCjHAI

Changelog

• Add missing call to ReadPointDisplacementLoad function within the main Read method

[Chrisshort92]

Approved for merge. Tested against test script

[peterjamesnugent]

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[peterjamesnugent]

@BHoMBot check ready-to-merge

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