striker goalie increase latest_mod ratio

config/trainer_config.yaml

     num_layers: 2
     self_play:
         window: 10
-        play_against_latest_model_ratio: 0.25
+        play_against_latest_model_ratio: 0.5
         save_steps: 50000
         swap_steps: 25000
         team_change: 200000
     num_layers: 2
     self_play:
         window: 10
-        play_against_latest_model_ratio: 0.25
+        play_against_latest_model_ratio: 0.5
         save_steps: 50000
         swap_steps: 100000
         team_change: 200000