style: pre-commit fixes

Author: pre-commit-ci[bot]

tests/unit/test_parameters/test_size_distribution_parameters.py

@@ -16,7 +16,7 @@ def test_parameter_values(self):
         # add distribution parameter values for negative electrode
         values = pybamm.get_size_distribution_parameters(values, electrode="negative")
 
-        # check positive parameters aren't there yet 
+        # check positive parameters aren't there yet
         with self.assertRaises(KeyError):
             values["Positive maximum particle radius [m]"]
 
@@ -41,7 +41,6 @@ def test_parameter_values(self):
         values.evaluate(param.p.prim.f_a_dist(R_test))
 
 
-
 if __name__ == "__main__":
     print("Add -v for more debug output")
     import sys