fix config

config/ppo/CubeWars.yaml

     self_play:
       save_steps: 50000
       team_change: 200000
-      swap_steps: 1000
+      swap_steps: 3000
       window: 10
       play_against_latest_model_ratio: 0.5
       initial_elo: 1200.0
     self_play:
       save_steps: 50000
       team_change: 200000
-      swap_steps: 3000
+      swap_steps: 1000
       window: 10
       play_against_latest_model_ratio: 0.5
       initial_elo: 1200.0