increase seq length

ml-agents/mlagents/trainers/tests/tensorflow/test_simple_rl.py

     )
     new_networksettings = attr.evolve(
         SAC_TF_CONFIG.network_settings,
-        memory=NetworkSettings.MemorySettings(memory_size=16, sequence_length=16),
+        memory=NetworkSettings.MemorySettings(memory_size=16),
-        batch_size=256,
+        batch_size=128,
-        buffer_init_steps=2000,
+        buffer_init_steps=1000,
         steps_per_update=2,
     )
     config = attr.evolve(