remove trades_for_order3

tests/conftest.py

@@ -1685,14 +1685,6 @@ def trades_for_order2():
              'fee': {'cost': 0.004, 'currency': 'LTC'}}]
 
 
-@pytest.fixture(scope="function")
-def trades_for_order3(trades_for_order2):
-    # Different fee currencies for each trade
-    trades_for_order = deepcopy(trades_for_order2)
-    trades_for_order[0]['fee'] = {'cost': 0.02, 'currency': 'BNB'}
-    return trades_for_order
-
-
 @pytest.fixture
 def buy_order_fee():
     return {