net/samba413: Work around 12.4 bug with orphaned temp files

Because src commit 96e101bec9 never made it into 12.4, temporary files
are littering the staging directory and causing plist errors. Since
12.4 will be EOL soon, just work around the issue.

PR: 255626
Approved by: portmgr (rene)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D42030