fix unit test for new kernel loop

Author: erikvansebille

tests/v4/test_particleset_execute.py

@@ -113,7 +113,7 @@ def PythonFail(particle, fieldset, time):  # pragma: no cover
         pset.execute(PythonFail, runtime=np.timedelta64(20, "s"), dt=np.timedelta64(2, "s"))
     assert len(pset) == npart
     assert pset.time[0] == fieldset.time_interval.left + np.timedelta64(10, "s")
-    assert all([time == fieldset.time_interval.left + np.timedelta64(8, "s") for time in pset.time[1:]])
+    assert all([time == fieldset.time_interval.left + np.timedelta64(0, "s") for time in pset.time[1:]])
 
 
 @pytest.mark.parametrize("verbose_progress", [True, False])