Revert "onclite: extract-files: Don't clean vendor by default"

This reverts commit 2db3f3cd.

* No point to set CLEAN_VENDOR=false by default.There is an option -n to use

Change-Id: Icd090c109d0f91950d97921abc4efffdf9bccbd2

extract-files.sh

@@ -35,7 +35,7 @@ fi
 . "$HELPER"
 
 # Default to sanitizing the vendor folder before extraction
-CLEAN_VENDOR=false
+CLEAN_VENDOR=true
 
 while [ "$1" != "" ]; do
     case $1 in