tcp: Fix TcpRateOps to update m_ackElapsed like Linux

Mohit P. Tahilianirequested to merge
mohittahiliani/ns-3-dev:bug-fixes into master

Co-authored-by: Chetan Agarwal chetanag35@gmail.com

This patch aligns the delivery rate estimation in ns-3 with Linux. The time gap between two consecutive rate estimates was calculated differently in ns-3; it is now aligned with Linux.

This was noticed in the process of aligning ns-3 BBR model (which is out of tree as of now) with Linux BBR model.

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