🐛 fix: Update deletePromptController to include user role in query

[danny-avila]

Closes #5486

Summary

• Updated the query in deletePromptController to include req.user.role
• Removed conditional logic that removed the author for admin users (redundant)

Change Type

• Bug fix (non-breaking change which fixes an issue)

Testing

I tested these changes locally by attempting to delete prompts under different user roles and confirming the correct behavior each time. Additional unit tests can be written to ensure role-based checks are validated under different scenarios.

Checklist

• My code adheres to this project's style guidelines
• I have performed a self-review of my own code
• I have commented in any complex areas of my code
• I have made pertinent documentation changes
• My changes do not introduce new warnings
• I have tested my changes
• Local unit tests pass with my changes

[jameslamine]

Thanks! I guess I can close my PR with a similar fix #5487