foamyHexMesh/flange/Allclean: Remove 0 directory

tutorials/mesh/foamyHexMesh/flange/Allclean

@@ -9,7 +9,7 @@ rm -r constant/triSurface/flange.stl.gz > /dev/null 2>&1
 rm -rf constant/extendedFeatureEdgeMesh > /dev/null 2>&1
 rm -r constant/ccx constant/ccy constant/ccz > /dev/null 2>&1
 rm -r constant/internalDelaunayVertices constant/targetCellSize > /dev/null 2>&1
-rm -r 0/ccx 0/ccy 0/ccz > /dev/null 2>&1
+rm -r 0 > /dev/null 2>&1
 
 rm -rf constant/backgroundMeshDecomposition/polyMesh/boundary > /dev/null 2>&1
 rm -rf constant/backgroundMeshDecomposition/polyMesh/faces > /dev/null 2>&1