CONFIG: ensure cleanCase removes postProcessing-dry-run (#1475)

bin/tools/CleanFunctions

@@ -93,6 +93,7 @@ cleanPostProcessing()
 {
     rm -rf Ensight EnSight ensightWrite insitu VTK > /dev/null 2>&1
     rm -rf postProcessing > /dev/null 2>&1
+    rm -rf postProcessing-dry-run > /dev/null 2>&1
     rm -rf cuttingPlane > /dev/null 2>&1
     rm -rf surfaceSampling > /dev/null 2>&1
 }