fix: Menu flashes blue when first opened

[alanbsmith]

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[mannycarrera4]

Look like the usePopupStack calls this after the popup is registered: https://github.com/Workday/canvas-kit/blob/master/modules/react/popup/lib/hooks/usePopupStack.ts#L104

We should move what this layouteffect is doing a little sooner into here: https://github.com/Workday/canvas-kit/blob/master/modules/react/popup/lib/hooks/usePopupStack.ts#L71