Fixed: Disable Dovecot systemd socket activation unit if any (not needed for Dovecot as configured by i-MSCP)

Quote from i-MSCP Github (hotfixes)

Code

1. Fixed: Disable Dovecot systemd socket activation unit if any (not needed for Dovecot as configured by i-MSCP)
2. Fixed: systemd[1]: [/lib/systemd/system/dovecot.socket:8] Failed to parse address value, ignoring: [::]:143 (on IPv4 only boxes)
3. Fixed systemd[1]: [/lib/systemd/system/dovecot.socket:10] Failed to parse address value, ignoring: [::]:993 (on IPv4 only boxes)
4. [ci skip]

Source: https://github.com/i-MSCP/imsc…82d86a523e8198c2681b41cb0