Settings_Engine: Ensure SaveSettings also updates settings in memory

[FraserGreenroyd]

Fixes #3295

[FraserGreenroyd]

@BHoMBot check compliance @BHoMBot check required

[bhombot-ci[bot]]

@FraserGreenroyd to confirm, the following actions are now queued: - check `code-compliance` - check `documentation-compliance` - check `project-compliance` - check `branch-compliance` - check `dataset-compliance` - check `copyright-compliance` - check `code-compliance` - check `documentation-compliance` - check `project-compliance` - check `core` - check `null-handling` - check `serialisation` - check `versioning` - check `installer`

[bhombot-ci[bot]]

The check `code-compliance` has already been run previously and recorded as a successful check. This check has not been run again at this time.

[bhombot-ci[bot]]

The check `documentation-compliance` has already been run previously and recorded as a successful check. This check has not been run again at this time.

[FraserGreenroyd]

@BHoMBot this is a DevOps instruction. I am requesting neutral checks on: unit-tests

[bhombot-ci[bot]]

@FraserGreenroyd I have provided neutral checks to the checks requested. These checks will need to be run properly to obtain full results.

[FraserGreenroyd]

@BHoMBot check ready-to-merge

[bhombot-ci[bot]]

@FraserGreenroyd to confirm, the following actions are now queued: - check `ready-to-merge` There are 1 requests in the queue ahead of you.