Fix flake8 error

freqtrade/data/btanalysis.py

@@ -129,7 +129,8 @@ def load_trades_from_db(db_url: str) -> pd.DataFrame:
     return trades
 
 
-def load_trades(source: str, db_url: str, exportfilename: Path, no_trades: bool = False) -> pd.DataFrame:
+def load_trades(source: str, db_url: str, exportfilename: Path,
+                no_trades: bool = False) -> pd.DataFrame:
     """
     Based on configuration option "trade_source":
     * loads data from DB (using `db_url`)

tests/data/test_btanalysis.py

@@ -117,7 +117,6 @@ def test_load_trades(default_conf, mocker):
     load_trades("file",
                 db_url=default_conf.get('db_url'),
                 exportfilename=default_conf.get('exportfilename'),
-                no_trades=False
                 )
 
     assert db_mock.call_count == 0