Fixed: Create default sieve script (filters), even if sieve is not av…

Quote from i-MSCP Github (1.5.3)

Code

1. Fixed: Create default sieve script (filters), even if sieve is not available (Dovecot IMAP/POP server implementation)

Source: https://github.com/i-MSCP/imsc…0f8ae836c6bb24bb69b8d8dc6