pass payload as install target to scripts

aps

@@ -16,7 +16,7 @@ run_package_script() { # --- $2 is the package path, and $1 is the script to run
         if [ -x "${2}/${1}" ]; then
             echo ":: Running ${1}"
             cd "${2}" || die "Could not enter package working directory. Exiting..."
-            "${2}/${1}" "${install_root}" "${2}"
+            "${2}/${1}" "${2}/payload" "${2}"
         fi
     }
 }