[webmin-l] ssl certificate - copy to dovecot misses intermediate certs

[Pat Erler]

I just realised, that the "copy to dovecot" button copies the certificate
but not the ca certificate from

/home/domain/ssl.ca to /etc/dovecot/dovecot.ca.pem

this is for "real" certificates (not letsencrypt, which seems to be broken
in regard to dovecot anyways, see earlier mail here)
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