Fix: cannot access local variable 'curr_display_value' for EQx cars

custom_components/mbapi2020/client.py

@@ -401,6 +401,7 @@ def _get_car_values(self, car_detail, car_id, class_instance, options, update):
                                     ].get("max_soc")
                                     status = "VALID"
                                     curr_unit = "PERCENT"
+                                    curr_display_value = value
                                 else:
                                     # charge_program_parameters does not exists, continue with the next option
                                     continue