Fix inverted player controls

[Vianpyro]

Description

Fixed inverted player controls. The left player now correctly uses W/S, and the right player uses Up/Down, matching standard Pong controls.

Related Issues

• Closes The player controls are inverted #18

Changes Made

• Corrected conditional in player controller assignment:
  • Changed if player == Player::Right to if player == Player::Left
• Verified both players’ input mappings correspond to their on-screen sides

Screenshots (if applicable)

N/A -- gameplay behavior fix only.

How to Test

1. Launch the game.
2. Move the left paddle using W and S.
3. Move the right paddle using Up and Down.
4. Confirm each player’s controls respond correctly and independently.

Checklist

• My code follows the project's coding style.
• I have performed a self-review of my code.
• I have tested the fix manually.
• I have documented my changes (if necessary).

Additional Context

Simple one-line fix to align player input mapping with expected behavior.