Error when selecting medium from the dropdown list

[JayHuLBL]

It is to address the issue reported in IBPSA issue #1924.

In class Buildings.Fluid.HeatExchangers.ConstantEffectiveness, the choices given by the dropdown causes the code to try to redeclare Medium instead of Medium1 or Medium2, and see following error:

---

The root cause is from the below code section in baseclass Buildings.Fluid.Interfaces.PartialFourPort:

 replaceable package Medium1 =
    Modelica.Media.Interfaces.PartialMedium "Medium 1 in the component"
      annotation (choices(
        choice(redeclare package Medium = Buildings.Media.Air "Moist air"),
        choice(redeclare package Medium = Buildings.Media.Water "Water"),
        choice(redeclare package Medium =
            Buildings.Media.Antifreeze.PropyleneGlycolWater (
          property_T=293.15,
          X_a=0.40)
          "Propylene glycol water, 40% mass fraction")));
  replaceable package Medium2 =
    Modelica.Media.Interfaces.PartialMedium "Medium 2 in the component"
      annotation (choices(
        choice(redeclare package Medium = Buildings.Media.Air "Moist air"),
        choice(redeclare package Medium = Buildings.Media.Water "Water"),
        choice(redeclare package Medium =
            Buildings.Media.Antifreeze.PropyleneGlycolWater (
          property_T=293.15,
          X_a=0.40)
          "Propylene glycol water, 40% mass fraction")));

The change will merge to the branches, master, the 11, 10 and 9 maintenance branches. And the error needs to done for the class Buildings.Fluid.Interfaces.EightPort.