test: update test for new logic

Author: xmatthias

tests/exchange/test_exchange.py

@@ -2506,6 +2506,8 @@ def test_refresh_latest_ohlcv_cache(mocker, default_conf, candle_type, time_mach
     time_machine.move_to(start + timedelta(hours=99, minutes=30))
 
     exchange = get_patched_exchange(mocker, default_conf)
+    exchange._set_startup_candle_count(default_conf)
+
     mocker.patch(f"{EXMS}.ohlcv_candle_limit", return_value=100)
     assert exchange._startup_candle_count == 0