[Dovecot] siever_dir default

[Antonio Casado Rodríguez]

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