Fix full load hours

I couldn't reproduce the full load hours previously set (1956.164053)
even with older versions of python (checked down to 3.8) and pandas
(checked down to 1.3.5), so I assume, that the value was incorrect. It
was possibly not checked, as the example tests are not in the tests
directory but the example directory.

Author: birgits

example/test_examples.py

@@ -42,7 +42,7 @@ def test_turbine_cluster_modelchain_example_flh(self):
         )
         tc_mc_e.calculate_power_output(weather, example_farm, example_cluster)
         assert_allclose(
-            1956.164053,
+            2004.84125,
             (example_farm.power_output.sum() / example_farm.nominal_power),
             0.01,
         )