Beta Branch revert aggressive postfix delivery overrides and keep postfix IPv4-on…

revert aggressive postfix delivery overrides and keep postfix IPv4-only in 140.00beta01

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Fresh installs raised per-destination concurrency to 200, tried every MX
host per delivery attempt and capped retry backoff at 1000s. When a
mailbox provider like Gmail rate limits the server (421-4.7.28), that
multiplies retry traffic and prolongs the block. checkipvsix() also
switched postfix inet_protocols from ipv4 back to all on every run,
undoing the IPv4-only default postfixsetup() applies with FORCE_IPVFOUR='y'.

Changes:
- postfixsetup(): stop overriding default_destination_concurrency_limit,
smtp_destination_concurrency_limit, smtp_mx_session_limit and
maximal_backoff_time so postfix defaults (20, 20, 2, 4000s) apply
- checkipvsix(): only switch postfix inet_protocols to all when
FORCE_IPVFOUR='n', matching postfixsetup()

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140.00beta01 branch

• Branch: https://github.com/centminmod/centminmod/tree/140.00beta01
• Commit History: https://github.com/centminmod/centminmod/commits/140.00beta01