Reapply "netfilter: conntrack: don't refresh sctp entries in closed state"

This reverts commit 2867afd6 as it
causes merge conflicts with 5.4.258.  It will be added back after the
merge.

Change-Id: Ibe09c3b147ba00fb3978f0b7372c5fbdbf1bc93d
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>