Fix rejoining game causing lobby to be empty

rust/src/game_manager.rs

@@ -59,6 +59,7 @@ impl GameManager {
     }
 
     pub fn init_game(&mut self, is_host: bool) {
+        self.exiting = false;
         if let Some(mut game) = self.game.take() {
             game.queue_free();
         }