fix train_encoder for coqpit

TTS/bin/train_encoder.py

@@ -19,14 +19,10 @@ from TTS.tts.datasets.preprocess import load_meta_data
 from TTS.utils.audio import AudioProcessor
 from TTS.utils.generic_utils import (
     count_parameters,
-    create_experiment_folder,
-    get_git_branch,
     remove_experiment_folder,
     set_init_dict,
 )
-from TTS.utils.io import copy_model_files, load_config
 from TTS.utils.radam import RAdam
-from TTS.utils.tensorboard_logger import TensorboardLogger
 from TTS.utils.training import NoamLR, check_update
 from TTS.utils.arguments import init_training