Remove unneeded beta param from SAC config

config/sac_trainer_config.yaml

 
 BouncerLearning:
     normalize: true
-    beta: 0.0
     max_steps: 5.0e5
     num_layers: 2
     hidden_units: 64
     max_steps: 5.0e4
     init_entcoef: 0.05
-    beta: 1.0e-2
     hidden_units: 256
     summary_freq: 2000
     time_horizon: 64
 StrikerLearning:
     max_steps: 5.0e5
     learning_rate: 1e-3
-    beta: 1.0e-2
     hidden_units: 256
     summary_freq: 2000
     time_horizon: 128
 GoalieLearning:
     max_steps: 5.0e5
     learning_rate: 1e-3
-    beta: 1.0e-2
     hidden_units: 256
     summary_freq: 2000
     time_horizon: 128
     hidden_units: 256
     buffer_init_steps: 1000
     num_layers: 1
-    beta: 1.0e-2
     max_steps: 5.0e5
     buffer_size: 500000
     init_entcoef: 0.01
     num_layers: 2
     hidden_units: 128
     memory_size: 256
-    beta: 0.0
     init_entcoef: 0.1
     max_steps: 5.0e5
     summary_freq: 1000
     num_layers: 1
     hidden_units: 128
     memory_size: 256
-    beta: 1.0e-2
     gamma: 0.99
     batch_size: 64
     max_steps: 5.0e5
     num_layers: 1
     hidden_units: 128
     memory_size: 256
-    beta: 1.0e-2
     gamma: 0.99
     buffer_size: 1024
     batch_size: 64