Fix detection of sudden congestion #1672
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The BBR code was detecting a sudden onset of congestion if the RTT jumped to 3 times the min RTT while in "ProbeBW" mode, but it was only taking action is the connection was not marked as "app limited". This is probably wrong, because the building of large queues only happens if the application sends more data than the pipe can forward, so it is de facto limited. Fixing that results in much lower peak latency in the "bandwidth going down" tests.