remove redundant dummy import

exo/main.py

@@ -20,7 +20,6 @@ from exo.download.hf.hf_shard_download import HFShardDownloader
 from exo.helpers import print_yellow_exo, find_available_port, DEBUG, get_system_info, get_or_create_node_id, get_all_ip_addresses, terminal_link
 from exo.inference.shard import Shard
 from exo.inference.inference_engine import get_inference_engine, InferenceEngine
-from exo.inference.dummy_inference_engine import DummyInferenceEngine
 from exo.inference.tokenizers import resolve_tokenizer
 from exo.orchestration.node import Node
 from exo.models import build_base_shard, get_repo