STYLE: adjust tutorial Allrun scripts (issue #310)

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

tutorials/stressAnalysis/solidDisplacementFoam/plateHole/Allrun

@@ -4,10 +4,8 @@ cd ${0%/*} || exit 1    # Run from this directory
 # Source tutorial run functions
 . $WM_PROJECT_DIR/bin/tools/RunFunctions
 
-application=`getApplication`
-
 runApplication blockMesh
-runApplication $application
+runApplication $(getApplication)
 runApplication -s sigma        postProcess -func "components(sigma)"
 runApplication -s singleGraph  postProcess -func singleGraph