fix : improve Rolling-Dice game loop with visual separator and consistent formatting

[tmdeveloper007]

Summary of What Has Been Done

In games/Rolling-Dice/Rolling-Dice.py, the game had two minor usability issues:

1. There was no visual separator between rounds, making it harder to distinguish turns.
2. The invalid input message and the quit path both lacked a trailing newline, causing visual clutter.

Changes Made

Added a visual separator print("\n" + "=" * 40) before each round prompt, and ensured consistent formatting with trailing newlines.

Impact it Made

• Better visual clarity between game rounds.
• Consistent formatting throughout the game output.

Closes #1860.

Note: Please assign this PR to the tmdeveloper007 account.

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