Build: fix path in ipa-ods-exporter.socket unit file
This fixes regression caused by incorrect
daemons/dnssec/ipa-ods-exporter.socket.in path template introduced
in commit 312e780041fc9025ca3c189e6c9fcb54c7340714.
https://fedorahosted.org/freeipa/ticket/6495
Reviewed-By: Martin Basti <mbasti@redhat.com>