fix: re-prompt on invalid input in Rock-Paper-Scissors instead of exiting

[nimkarprachi17]

Title:
[PR]: fix: re-prompt on invalid input in Rock-Paper-Scissors instead of exiting

Description:
When a user types an invalid choice (anything other than r, p, or s), the game was immediately exiting with "Rerun the game..." instead of re-prompting. This was especially bad UX since even a single typo forced a full restart.

Changes made:

• Replaced Flag = False with continue so the loop re-prompts on invalid input
• Removed the redundant elif Flag block since invalid input now never reaches game logic
• Invalid input no longer falls through to the "Continue playing?" prompt

Related Issue:
Closes #242

How Has This Been Tested:

• Tested on Windows
• Multiple test runs completed
• Edge cases tested

Typed invalid inputs (e.g. 'x', 'rock', '1', uppercase 'R') at the choice prompt.
Game now re-prompts with a friendly message instead of exiting.
Valid inputs (r, p, s) and continue/exit flow work exactly as before.

Environment:
Python Version: 3.x
OS: Windows

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