[form] fix bug introduced by 4871:a34b76593ab2 with field using multiple input with different suffix: the suffix should be considered in the cache key
#! /bin/sh -e#if [ "$1" = configure ]; then if which install-docs >/dev/null 2>&1; then install-docs -i /usr/share/doc-base/cubicweb-doc fifi#DEBHELPER#exit 0