fix: changed waitlist status default to open

[ColinBuyck]

This PR addresses #1339 by switching the default checked field from the closed waitlist option to the open waitlist option.

How Can This Be Tested/Reviewed?

This can be tested on the Detroit partners side by adding a new listing and then clicking 'Add Unit Group. After scrolling down you will see open waitlist is selected by default.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have reviewed the changes in a desktop view
• I have reviewed the changes in a mobile view
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have assigned reviewers
• I have run yarn generate:client and/or created a migration if I made backend changes that require them
• I have exported any new pieces added to ui-components
• My commit message(s) is/are polished, and any breaking changes are indicated in the message and are well-described
• Commits made across packages purposefully have the same commit message/version change, else are separated into different commits

Reviewer Notes:

Steps to review a PR:

• Read and understand the issue
• Review the code itself from a style point of view
• Pull the changes down locally and test that the acceptance criteria is met
• Also review the acceptance criteria on the Netlify deploy preview (noting that these do not yet include any backend changes made in the PR)
• Either explicitly ask a clarifying question, request changes, or approve the PR if there are small remaining changes but the PR is otherwise good to go

On Merge:

If you have one commit and message, squash. If you need each message to be applied, rebase and merge.

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[YazeedLoonat]

LGTM