multicomponentFluid: Correct boundary conditions of non-solved species

Whilst the cell values of non-solved species do not change, the boundary
values might, and correcting them is necessary for certain
post-processing operations to produce sensible results.

applications/modules/multiphaseEuler/phaseSystem/phaseModels/PurePhaseModel/PurePhaseModel.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     | Website:  https://openfoam.org
-    \\  /    A nd           | Copyright (C) 2015-2023 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2015-2024 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -104,24 +104,12 @@ Foam::PurePhaseModel<BasePhaseModel>::YRef()
 
 
 template<class BasePhaseModel>
-const Foam::UPtrList<Foam::volScalarField>&
-Foam::PurePhaseModel<BasePhaseModel>::YActive() const
+bool Foam::PurePhaseModel<BasePhaseModel>::solveSpecie
+(
+    const label speciei
+) const
 {
-    // Y_ has never been set, so we are returning an empty list
-
-    return Y_;
-}
-
-
-template<class BasePhaseModel>
-Foam::UPtrList<Foam::volScalarField>&
-Foam::PurePhaseModel<BasePhaseModel>::YActiveRef()
-{
-    FatalErrorInFunction
-        << "Cannot access the species fractions of for a pure phase"
-        << exit(FatalError);
-
-    return Y_;
+    return false;
 }