g10: Fix another race condition for trustdb access.

* g10/tdbio.c (create_version_record): Call create_hashtable to always
make hashtable, together with the version record.
(get_trusthashrec): Remove call to create_hashtable.

Thanks to Scott Moser to reproducible script and patience.

(backport from master
commit 35a3ce2acf78a95fecbccfd8db0560cca24232df)

• GnuPG-bug-id: T1675
• Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>