fix: sets data marketing to false in case of non-selection

[jonybur]

Description

Avoids showing the experience enhancer modal after onboarding.

Related issues

Fixes: https://github.com/MetaMask/MetaMask-planning/issues/2704

Manual testing steps

1. Onboard
2. User should not see experience enhancer after onboarding

Screenshots/Recordings

Before

After

Pre-merge author checklist

• [ ] I’ve followed MetaMask Contributor Docs and MetaMask Mobile Coding Standards.
• [ ] I've completed the PR template to the best of my ability
• [ ] I’ve included tests if applicable
• [ ] I’ve documented my code using JSDoc format if applicable
• [ ] I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• [ ] I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• [ ] I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.