Fix(todo): Correct filter logic

[kmanish527]

🚀 Pull Request Checklist

• ✅ My issue is assigned to me, and I have not taken up another task simultaneously.
• 🔁 I have pulled the latest changes from the main branch.
• 🧪 My code is tested and does not break existing functionality.
• 📚 I have added/updated documentation wherever necessary.
• 🧹 My code follows the project’s coding standards.
• ✍️ My commits are clear and meaningful.
• 🧾 I have linked the issue this PR addresses with Closes #193 .

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📌 Related Issue

Closes #193

🧠 Description

Bug
when the 'Upcoming deadlines' filter is selected, only the 'Pending' tasks section should be visible, while the 'Completed' tasks section should be hidden

Fixed
when the 'Upcoming deadlines' filter is selected, only the 'Pending' tasks section is visible, and the 'Completed' tasks section is hidden

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✅ Type of Change

• 🐞 Bug fix
• 💡 Feature
• 🧹 Code cleanup/refactor
• 🧪 Test cases
• 📚 Docs update

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[github-actions]

🙌 Thanks @kmanish527 for raising this PR!
Our team will review it soon ⏳ — meanwhile, please make sure your PR follows our contributing guidelines 👉 Contributing Guidelines 🎉

[github-actions]

🎉🎉 Thank you for your contribution! Your PR #194 has been merged! 🎉🎉