Remove a stray debug print that tripped ruff E501

test_charge_states_and_defect_species_have_fixed_concentration ended
with a leftover print() of dilute_charge_state_concentrations, sitting
after the real assertion and adding no coverage. At 101 characters it
failed the line-length check; drop it.

Author: bjmorgan

tests/test_defect_species.py

@@ -407,7 +407,6 @@ def test_charge_states_and_defect_species_have_fixed_concentration(self):
                 self.defect_species.charge_states[2]
             ],
         )
-        print(self.defect_species.dilute_charge_state_concentrations(e_fermi=1.5, temperature=298.0))
 
     def test_variable_concentration_charge_states(self):
         self.defect_species.charge_states[0].fixed_concentration = 0.1234