fvMeshStitchers::moving: Prevent communication missmatch

The sub mesh on which mesh fluxes are corrected potentially only exists
on a small subset of the processors. This was causing issues when
processor boundaries were evaluated as this triggered the construction
of weights and delta coefficients on only some of the processors,
causing a communications missmatch. This has been resolved by a
pre-emptive call to construct the surface interpolation coefficients.

src/fvMeshStitchers/moving/fvMeshStitchersMoving.C

@@ -297,6 +297,7 @@ void Foam::fvMeshStitchers::moving::internalFaceCorrectMeshPhi
     fvMeshSubset subsetter(mesh());
     subsetter.setLargeCellSubset(ownerCoupledCellSet());
     const fvMesh& subMesh = subsetter.subMesh();
+    subMesh.deltaCoeffs();
 
     // Determine the disconnected regions of the sub mesh
     const regionSplit subMeshRegions(subMesh);