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tcp rack: improve initialisation of retransmit timeout

Description

tcp rack: improve initialisation of retransmit timeout

When the TCP is in the front states, don't take the slop variable
into account. This improves consistency with the base stack.

Reviewed by: rrs@
Differential Revision: https://reviews.freebsd.org/D30230
Sponsored by: Netflix, Inc.

(cherry picked from commit 251842c63927fc4af63bdc61989bbfbf3823c679)

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