fix: next button tweak

[Dhruwang]

What does this PR do?

Now we don't automatically update the next button label for last question
Also if we now change next button label for last question, it wont get change next button label for other questions

Fixes 1705

How should this be tested?

Change next button label for last question

Checklist

Required

• Filled out the "How to test" section in this PR
• Read How we Code at Formbricks
• Self-reviewed my own code
• Commented on my code in hard-to-understand bits
• Ran pnpm build
• Checked for warnings, there are none
• Removed all console.logs
• Merged the latest changes from main onto my branch with git pull origin main
• My changes don't cause any responsiveness issues
• First PR at Formbricks? Please sign the CLA! Without it we wont be able to merge it 🙏

Appreciated

• If a UI change was made: Added a screen recording or screenshots to this PR
• Updated the Formbricks Docs if changes were necessary

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2 Ignored Deployments

Name	Status	Preview	Updated (UTC)
formbricks-cloud	⬜️ Ignored (Inspect)		Jan 16, 2024 8:14am
formbricks-com	⬜️ Ignored (Inspect)		Jan 16, 2024 8:14am

[github-actions]

Thank you for following the naming conventions for pull request titles! 🙏

[mattinannt]

@Dhruwang thank you for the quick fix :-) 💪🔥