Fix malformed request body in New-RubrikBootstrap

[shamsway]

Description

Fix malformed request body in New-RubrikBootstrap

Related Issue

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• If fixing a bug, there should be an issue describing it with steps to reproduce

#568

Motivation and Context

Why is this change required? What problem does it solve?

Addresses #568

How Has This Been Tested?

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Manual testing against un-bootstrapped edge, unit tests

Screenshots (if appropriate):

Types of changes

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

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• My code follows the code style of this project.
• My change requires a change to the documentation.
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• I have read the CONTRIBUTION document.
• I have updated the CHANGELOG file accordingly for the version that this merge modifies.
• I have added tests to cover my changes.
• All new and existing tests passed.

[jaapbrasser]

Looks good, thanks for the fix @shamsway