Dovecot must have been installed on your server at the time when the last ispconfg update was installed as your server is configured for dovecot at the moment.
Check with:
which dovecot
that really no dovecot binary is installed anymore now, then download ispconfig tar.gz agaian, run the update.php script and choose to reconfigure services so that your server gets configured for courier again. You should see in the installer output that it configures courier then and not dovecot.
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