[Dovecot] siever_dir default

Hi all

I have this:

# The path to the directory where the personal Sieve scripts are stored. For # ManageSieve this is where the uploaded scripts are stored. #sieve_dir=~/sieve

but the correct is

# The path to the directory where the personal Sieve scripts are stored. For # ManageSieve this is where the uploaded scripts are stored. # Default value: {mail_location}/sieve #sieve_dir=~/sieve