Fix handling of arguments in autohelp-wrapper

The shift should happen after the final processing, otherwise
getopts aborts if more than one parameter is given.

Change-Id: I47e9f390cfe08404e71b26c49b02871b3b34f303

autogenerate_config_docs/autohelp-wrapper

@@ -104,19 +104,15 @@ while getopts :b:e:cf opt; do
     case $opt in
     b)
         BRANCH=$OPTARG
-        shift 2
         ;;
     c)
         rm -rf $VENVDIR
-        shift
         ;;
     e)
         VENVDIR=$OPTARG
-        shift 2
         ;;
     f)
         FAST=1
-        shift
         ;;
     \?)
         usage
@@ -124,6 +120,7 @@ while getopts :b:e:cf opt; do
         ;;
     esac
 done
+shift $(($OPTIND - 1))
 
 if [ $# -lt 1 ]; then
     usage