Core: Only call setup function on story navigation

[shilman]

Issue: N/A

What I did

CSF3 (experimental) introduces a setup function that gets called after every story render. The problem is that if you update the controls, it causes the setup function to re-render, and args changes can result in elements not being on screen when the setup function needs them.

The solution in this PR is to not run the setup function when (the confusingly named) forceRender is set. forceRender means that there was no story navigation and we want to force the story to re-render for some other reason.

How to test

See the AccountForm "Verification Password Mismatch" demo in examples/react-ts. After the setup function finishes, toggle the passwordVerification boolean. This causes a crash prior to this PR, but simply adjusts the prop as expected after this PR.

self-merging @tmeasday

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