FIX: Export touchstone on completion bug

[Samuelopez-ansys]

Description

This pull request updates the property keys used when exporting simulation results in the export_touchstone_on_completion method of src/ansys/aedt/core/hfss.py. The change ensures that the property names match the expected format for design settings.

• Property Key Updates:
  • Changed the keys in the props dictionary from "ExportAfterSolve" and "ExportDir" to "Export After Simulation" and "Export Dir" in the export_touchstone_on_completion method to align with the correct design settings nomenclature.

Bug introduced in #6367

This can not be tested because there is no way to get the value of the checkbox.

Application: hfss
AEDT-Version: 25.2, 26.1
Platform: windows, linux

Issue linked

Close #7712

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue(s) that are solved by the PR if any.
• I have assigned this PR to myself.
• I have added the minimum version decorator to any new backend method implemented.
• I have agreed with the Contributor License Agreement (CLA).