delete function in BST not working while deleting first element if its the lowest

https://github.com/codebasics/data-structures-algorithms-python/blob/master/data_structures/9_Binary_Tree_2/binary_tree_part_2.py
![image](https://github.com/user-attachments/assets/57dc4840-a040-4ec5-9317-9068091e3010)
