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internet: Call BytesInFlight () method before processing an ACK to update m_bytesInFlight variable

Apoorva Bhargava requested to merge apoorvabhargava/ns-3-dev:update_bytes_in_flight_before_process_ack into master

This patch calls the BytesInFlight () method before processing the ACK for the proper calculation of the congestion window. PRR recovery algorithm uses m_bytesInFlight variable to update the cwnd in its DoRecovery () method. As m_bytesInFlight was not getting updated, the cwnd value in the DoRecovery () method of PRR considered the previous value of m_bytesInFlight rather than current value. Calling BytesInFlight () method before processing the ACK removes this inconsistency.

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