Fix units case in available result (#1238)

Author: rafacanton

src/ansys/dpf/core/available_result.py

@@ -186,7 +186,7 @@ def homogeneity(self):
     @property
     def unit(self):
         """Unit of the result."""
-        return self._unit.lower()
+        return self._unit
 
     @property
     def operator_name(self):

tests/test_resultinfo.py

@@ -100,7 +100,7 @@ def test_print_available_result_with_qualifiers(cfx_heating_coil, server_type):
 Number of components: 1
 Dimensionality: scalar
 Homogeneity: specific_heat
-Units: j/kg*k^-1
+Units: J/kg*K^-1
 Location: Nodal
 Available qualifier labels:"""  # noqa: E501
     ref2 = "'phase': 2"