fix(favorite_model): correct string interpolation syntax in logger statements

app/models/favorite_model.py

@@ -17,7 +17,7 @@ class BookMyServiceFavoriteModel:
         favorite_data:dict
     ):
         """Create a new favorite merchant entry"""
-        logger.info(f"Creating favorite for customer {customer_id}, merchant {favorite_data["merchant_id"]}")
+        logger.info(f"Creating favorite for customer {customer_id}, merchant {favorite_data['merchant_id']}")
         
         try:
             # Check if favorite already exists
@@ -48,7 +48,7 @@ class BookMyServiceFavoriteModel:
                 {"$set": {"favorites": sanitized_favorite}}
             )
             if update_res.modified_count > 0:
-                logger.info(f"favourites created successfully: {favorite_data["merchant_id"]} for user: {customer_id}")
+                logger.info(f"favourites created successfully: {favorite_data['merchant_id']} for user: {customer_id}")
             else:
                 logger.info(f"favourites creation attempted with no modified_count for user: {customer_id}")