Update ping_pong.py

[adixoo]

The previous code had some errors, such as the "os" module not being imported and incorrect variable names, which could lead to program crashes in the middle.

Type of change

• I added "import os" because the os module was used in the project but not imported.
• I created variables like "ball_dx" and "ball_dy" that were not declared before but were used in the program, leading to an error.
• I commented out code that was attempting to play an audio file that was not located in the project directory.
• Added new comments to make code more readable.
• Fix the position of the right paddle.
• Fixed some logic for the ball movements.

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[Mrinank-Bhowmick]

Thanks @adixoo for correcting the codebase 👍