feat: remove unused variables and commented code

src/game/TetrisGameManager.py

@@ -5,9 +5,6 @@
 from src.game.board import Action, Board
 
 baseScore = 100
-DOWN = (0, 1)
-LEFT = (-1, 0)
-RIGHT = (1, 0)
 
 """ TODO:   Timer for piece drop 
             keyboard input for piece movement
@@ -38,10 +35,6 @@ def __init__(self, board: Board):
             Key.up: Action.ROTATE_CLOCKWISE,
         }
 
-        # while True:
-        #     with Listener(on_press=self.on_press, on_release=self.on_release) as listener:
-        #         listener.join()
-
     def onPress(self, key):
         # Default action if key not found
         default_action = lambda: "Key not recognized"