fix: resolve SyntaxError in ls.py due to indentation

src/exchanges/ls.py

@@ -1,4 +1,6 @@
 import requests
+import csv
+import io
 from datetime import datetime
 from typing import List
 from .base import BaseExchange, Trade
@@ -25,13 +27,10 @@ class LSExchange(BaseExchange):
                 response = requests.get(url, headers=headers)
                 response.raise_for_status()
             
-            import csv
-            import io
                 f = io.StringIO(response.text)
                 # Header: isin;displayName;tradeTime;price;currency;size;orderId
                 reader = csv.DictReader(f, delimiter=';')
                 
-            trades = []
                 for item in reader:
                     try:
                         price = float(item['price'].replace(',', '.'))