BUG: Fix dynamicRefineFvMesh mapping flux.

dynamicRefineFvMesh optionally can map fluxes derived from velocities
fields specified in dynamicMeshDict. The surface interpolation was
using old weights. This fix clear the old weights before mapping
the fluxes

src/dynamicFvMesh/dynamicRefineFvMesh/dynamicRefineFvMesh.C

@@ -243,6 +243,12 @@ void Foam::dynamicRefineFvMesh::mapFields(const mapPolyMesh& mpm)
         (
             lookupClass<surfaceScalarField>()
         );
+
+        // Remove surfaceInterpolation to allow re-calculation on demand
+        // This could be done in fvMesh::updateMesh but some dynamicFvMesh
+        // might need the old interpolation fields (weights, etc).
+        surfaceInterpolation::clearOut();
+
         forAllIters(fluxes, iter)
         {
             if (!correctFluxes_.found(iter.key()))