Settings menu items unavailable when none already selected. (PP-1022)

[tdilauro]

Description

• Fixes a check and a default value in the code that filters already-selected options from the list available options for menu settings.
• Adds a test that fails without this change, but passes with it.
• Some typing fixes in unrelated parts of the affected file, in order to appease eslint.

Motivation and Context

The bug resulted in no options being available for selection if none were already selected.

[Jira PP-1022]

How Has This Been Tested?

• Manually tested in a local development environment.
• Added a new confirmation test.
• Tests pass locally.

Checklist:

• N/A I have updated the documentation accordingly.
• All new and existing tests passed.

[ray-lee]

I made a few comments, but nothing is a blocker.