reverting last change in backened.py (deice = cpu)

Author: Taniya-Das

backend/backend.py

@@ -16,7 +16,6 @@
     config["test_subset"] = True
     config["data_dir"] = "./data/testing_data/"
 
-config["device"] = "cpu"
 # load the persistent database using ChromaDB
 print('Loading DB')
 client = chromadb.PersistentClient(path=config["persist_dir"])