🧹 Remove unused imports in assign4.py

[ManupaKDU]

🎯 What: Removed unused wave and struct imports from Learning/Part-1/Python/assign4.py.
💡 Why: These modules were imported but never used in the script, as it only utilizes numpy and matplotlib.pyplot. Removing them improves code maintainability and readability by eliminating unnecessary dependencies.
✅ Verification: Verified the python syntax using python3 -m py_compile and ran the full unit test suite, confirming that the change is completely safe and no regressions were introduced.
✨ Result: A cleaner script with only its actual dependencies imported.

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PR created automatically by Jules for task 18051766797554887107 started by @ManupaKDU

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