update test to keep using dynamic gain constants

tests/test_reference_runs/callab_tests.py

@@ -242,6 +242,7 @@ automated_test_config = {
             "sequences": "0,1",
             "karabo-id-control": "",
             "karabo-id": "FXE_XAD_JF1M",
+            "gain-mode": 0,
             "karabo-da": ["JNGFR01", "JNGFR02"],
         },
         "reference-folder": "{}/{}/{}",