Fix Flake8 errors after flake update

freqtrade/optimize/backtesting.py

@@ -595,7 +595,7 @@ class Backtesting:
             if exit_.exit_type in (ExitType.EXIT_SIGNAL, ExitType.CUSTOM_EXIT):
                 # Checks and adds an exit tag, after checking that the length of the
                 # row has the length for an exit tag column
-                if(
+                if (
                     len(row) > EXIT_TAG_IDX
                     and row[EXIT_TAG_IDX] is not None
                     and len(row[EXIT_TAG_IDX]) > 0

freqtrade/optimize/optimize_reports.py

@@ -639,7 +639,7 @@ def text_table_tags(tag_type: str, tag_results: List[Dict[str, Any]], stake_curr
     :param stake_currency: stake-currency - used to correctly name headers
     :return: pretty printed table with tabulate as string
     """
-    if(tag_type == "enter_tag"):
+    if (tag_type == "enter_tag"):
         headers = _get_line_header("TAG", stake_currency)
     else:
         headers = _get_line_header("TAG", stake_currency, 'Sells')