Hard Coded Path in Object_Tracking.py

There is a hard coded path in the [Object_Tracking.py](https://github.com/atom-robotics-lab/object_follower/blob/cca0849f6f33c95ec7b5cb9a0f52b9fb0e7cd890/object_follower_hardware/src/Object_Tracking.py#L47C21-L47C21) script.
It should be removed and replaced with an input command-line argument using [argparse](https://docs.python.org/3/library/argparse.html) if some one wants to run the image directly.