fix : cleaned up handle_keypress arrow key handling in 2048-Game

[tmdeveloper007]

Summary of What Has Been Done

Simplified and hardened the handle_keypress method in games/2048-Game/2048-Game.py by removing the conditional .lower() call and using .get() with direct key-to-action mapping.

Changes Made

• Removed the faulty event.keysym.lower() if len(event.keysym) == 1 else event.keysym conditional
• Changed to direct event.keysym usage
• Added uppercase key variants (A, W, S, D) directly to the move_map instead of relying on .lower() transformation
• Changed from if key not in move_map check + dict lookup to safer .get() with None check
• Uses action() instead of move_map[key]() to avoid double lookup

Impact it Made

• Removes the edge-case condition that could cause unexpected behavior with certain key events
• Makes keyboard handling more explicit and maintainable
• Handles both lowercase and uppercase WASD keys directly without string transformation

Closes #1845

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