[dataimport] Fix method signature
Since d4bd28d5fca8, _storage_handler expect 4 args.
grafted from b089858c49a2806b6ea8a7ee66773436701e947c (3.22)
related to #9177565.
#! /bin/sh -ecase "$1" in remove) if [ -x "/etc/init.d/cubicweb-ctl" ]; then invoke-rc.d cubicweb-ctl stop || true fi ;;esac#DEBHELPER#exit 0