Refactor creation of private fields

[jordanjones243]

Alaska Airlines Pull Request

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Resolves: #300

Summary:

Please summarize the scope of the changes you have submitted, what the intent of the work is and anything that describes the before/after state of the project.

Move the instantiation of the private fields into a function called privateDefaults, which is then called in the connectedCallback function to ensure that the fields get instantiated only when the component is attached to the DOM.

Type of change:

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• [ ] New capability
• [x] Revision of an existing capability
• [ ] Infrastructure change (automation, etc.)
• [ ] Other (please elaborate)

Checklist:

• [x] My update follows the CONTRIBUTING guidelines of this project
• [x] I have performed a self-review of my own update

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[blackfalcon]

:tada: This PR is included in version 2.17.10 :tada:

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