STYLE: adjust tutorial Allrun scripts (issue #310)

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

tutorials/multiphase/MPPICInterFoam/twoPhasePachuka/Allrun

@@ -4,9 +4,6 @@ cd ${0%/*} || exit 1    # Run from this directory
 # Source tutorial run functions
 . $WM_PROJECT_DIR/bin/tools/RunFunctions
 
-# Set application name
-application=$(getApplication)
-
 # create the underlying block mesh
 m4 system/pachuka.m4 > system/blockMeshDict