template cases: added nCellsBetweenLevels to snappyHexMeshDict files

etc/templates/closedVolume/system/snappyHexMeshDict

@@ -60,6 +60,7 @@ castellatedMeshControls
 
     locationInMesh (1e-5 1e-5 1e-5); // Offset from (0 0 0) to avoid
                                      // coinciding with face or edge
+    nCellsBetweenLevels 3;
 }
 
 snapControls

etc/templates/closedVolumeRotating/system/snappyHexMeshDict

@@ -83,6 +83,7 @@ castellatedMeshControls
 
     locationInMesh (1e-5 1e-5 1e-5); // Offset from (0 0 0) to avoid
                                      // coinciding with face or edge
+    nCellsBetweenLevels 3;
 }
 
 snapControls

etc/templates/compressibleInflowOutflow/system/snappyHexMeshDict

@@ -84,6 +84,7 @@ castellatedMeshControls
 
     locationInMesh (1e-5 1e-5 1e-5); // Offset from (0 0 0) to avoid
                                      // coinciding with face or edge
+    nCellsBetweenLevels 3;
 }
 
 snapControls

etc/templates/inflowOutflow/system/snappyHexMeshDict

@@ -84,6 +84,7 @@ castellatedMeshControls
 
     locationInMesh (1e-5 1e-5 1e-5); // Offset from (0 0 0) to avoid
                                      // coinciding with face or edge
+    nCellsBetweenLevels 3;
 }
 
 snapControls

etc/templates/inflowOutflowRotating/system/snappyHexMeshDict

@@ -112,6 +112,7 @@ castellatedMeshControls
 
     locationInMesh (1e-5 1e-5 1e-5); // Offset from (0 0 0) to avoid
                                      // coinciding with face or edge
+    nCellsBetweenLevels 3;
 }
 
 snapControls