sbopkg: Use _parse_help.

Reviewed-by: Sergey V <sftp.mtuci@gmail.com>

completions/sbopkg

@@ -6,9 +6,8 @@ _sbopkg()
     _init_completion || return
 
     if [[ "$cur" == -* ]]; then
-        COMPREPLY=( $( compgen -W '-b -c -d -e -f -g -h -i -k -l -o
-            -P -p -q -R -r -s -u -V -v' -- "$cur" ) )
-        return
+        COMPREPLY=( $( compgen -W '$( _parse_help "$1" -h )' -- "$cur" ) )
+        [[ $COMPREPLY ]] && return
     fi
 
     case "$prev" in