Pong: Explicitly clear held keys in Game::reset()

The paddle's movement is determined by the currently held keys. A key
is no longer considered held when a matching keyup_event() fires.
However, the event does not fire when the timer has stopped (e.g. due to
a game over condition), which can result in the paddle keeping its
former direction and moving on its own -- even after the player started
a new game. Therefore, any held keys will be cleared explicitly.

Userland/Games/Pong/Game.cpp

@@ -15,6 +15,12 @@ Game::Game()
     reset();
 }
 
+void Game::reset_keys()
+{
+    m_up_key_held = false;
+    m_down_key_held = false;
+}
+
 void Game::reset_paddles()
 {
     if (m_cursor_paddle_target_y.has_value())
@@ -46,6 +52,7 @@ void Game::reset()
 
     reset_scores();
     reset_ball(1);
+    reset_keys();
     reset_paddles();
 }
 

Userland/Games/Pong/Game.h

@@ -41,6 +41,7 @@ private:
 
     void reset_scores();
     void reset_ball(int serve_to_player);
+    void reset_keys();
     void reset_paddles();
     void tick();
     void round_over(int player);