Update OneByteWallhack.py

[badrshs]

Refactor code for better maintainability and implement best practices for working with process memory

This commit adds error handling to the code to handle potential errors when working with process memory. It also uses constants to define the byte pattern and module name, improving code readability. Additionally, a context manager is used to ensure that the process handle is closed automatically when the code exits the context. These changes improve the maintainability of the code and ensure that it follows best practices for working with process memory.