[Bug Fix] fix chromadb where clause for query and delete (#937)

Co-authored-by: Deven Patel <deven298@yahoo.com>

embedchain/apps/app.py

@@ -3,7 +3,8 @@ from typing import Optional
 import yaml
 
 from embedchain.client import Client
-from embedchain.config import AppConfig, BaseEmbedderConfig, BaseLlmConfig, ChunkerConfig
+from embedchain.config import (AppConfig, BaseEmbedderConfig, BaseLlmConfig,
+                               ChunkerConfig)
 from embedchain.config.vectordb.base import BaseVectorDbConfig
 from embedchain.embedchain import EmbedChain
 from embedchain.embedder.base import BaseEmbedder