STYLE: adjust tutorial Allrun scripts (issue #310)

- A few without a 'cd' at the start.
  Use $(getApplication) directly in more places (for clarity).

tutorials/incompressible/pimpleFoam/LES/channel395/Allrun

@@ -4,17 +4,15 @@ cd ${0%/*} || exit 1    # Run from this directory
 # Source tutorial run functions
 . $WM_PROJECT_DIR/bin/tools/RunFunctions
 
-# Get application directory
-application=$(getApplication)
 
 runApplication blockMesh
 
 #- Run serial
-#runApplication $application
+#runApplication $(getApplication)
 
 #- Run parallel
 runApplication decomposePar -cellDist
-runParallel $application
+runParallel $(getApplication)
 runApplication reconstructPar
 
 runApplication postChannel