Structure_Engine: Align with migration of Structures datasets to subfolder

[IsakNaslundBh]

NOTE: Depends on

BHoM/BHoM_Datasets#122

Issues addressed by this PR

Aligns hardcoded paths to datasets migrated to discipline superfolder.

Test files

Changelog

Additional comments

[FraserGreenroyd]

Code changes reviewed only, looks aligned per discussion with @IsakNaslundBh

[bhombot-ci]

@IsakNaslundBh just to let you know, I have provided a check-installer result to this Pull Request as it was detected to be linked to other Pull Requests in a series. The comment which triggered this check came from @peterjamesnugent on BHoM_Datasets

[IsakNaslundBh]

@BHoMBot check required

[bhombot-ci]

@IsakNaslundBh to confirm, the following actions are now queued:

• check code-compliance
• check documentation-compliance
• check project-compliance
• check core
• check null-handling
• check serialisation
• check versioning
• check installer

There are 6 requests in the queue ahead of you.

[bhombot-ci]

The check installer has already been run previously and recorded as a successful check. This check has not been run again at this time.

[IsakNaslundBh]

@BHoMBot check copyright-compliance
@BHoMBot check dataset-compliance
@BHoMBot check unit-tests

[bhombot-ci]

@IsakNaslundBh to confirm, the following actions are now queued:

• check copyright-compliance
• check dataset-compliance
• check unit-tests

There are 5 requests in the queue ahead of you.

[bhombot-ci]

@IsakNaslundBh just to let you know, I have provided a check-ready-to-merge result to this Pull Request as it was detected to be linked to other Pull Requests in a series. The comment which triggered this check came from @IsakNaslundBh on BHoM_Datasets