Change `fixStacktrace` default to `false`

[benmccann]

Clear and concise description of the problem

SvelteKit needs to set fixStacktrace: false everywhere (sveltejs/kit#4468). This might be the better default in 3.0

Suggested solution

Change fixStacktrace default from true to false

Alternative

No response

Additional context

No response

Validations

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• Read the Contributing Guidelines.
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