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

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.