Merge pull request modelica#4104 from henrikt-ma/fixedboundary-quantity

Remove modification of 'quantity' for FixedBoundary.X

Author: arunkumar-narasimhan

Modelica/Fluid/Sources.mo

@@ -28,8 +28,7 @@ package Sources "Define fixed or prescribed boundary conditions"
       "Boundary specific enthalpy"
       annotation (Dialog(group="Boundary temperature or boundary specific enthalpy",
                   enable = not use_T));
-    parameter Medium.MassFraction X[Medium.nX](
-         quantity=Medium.substanceNames) = Medium.X_default
+    parameter Medium.MassFraction X[Medium.nX] = Medium.X_default
       "Boundary mass fractions m_i/m"
       annotation (Dialog(group = "Only for multi-substance flow", enable=Medium.nXi > 0));
     parameter Medium.ExtraProperty C[Medium.nC](