Revert "syncrepo: Properly clean up .~tmp~ dirs"

This reverts commit 75f9ca3c.

This should be fixed in rsync versions newer than 3.2.3. In Arch the fix
has been shipped in the rsync 3.2.3-4 package, which our own mirrors now
have been updated to.

[1] https://github.com/WayneD/rsync/issues/192

roles/syncrepo/files/syncrepo

@@ -68,9 +68,6 @@ lastupdate_url='https://rsync.archlinux.org/lastupdate'
 [ ! -d "${target}" ] && mkdir -p "${target}"
 [ ! -d "${tmp}" ] && mkdir -p "${tmp}"
 
-# Cleanup any temporary files from old run that might remain.
-find "${target}" -name '.~tmp~' -exec rm -r {} +
-
 exec 9>"${lock}"
 flock -n 9 || exit