Change TCP max segement size to 1200 to be comparable to QUIC

...ngth_for_tcp_and_quic_packets/capture_20250208163100.pcap

...for_tcp_and_quic_packets/sslkeylogfile_20250208163100.log

...ulation-exp/code/kex/saved/qlogdir/cquiche-mlkem512.sqlog

...amework/emulation-exp/code/kex/scripts/analyze_packets.py

...amework/emulation-exp/code/kex/scripts/generate_graphs.py

...emulation-exp/code/kex/scripts/helper_scripts/setup_ns.sh

...hmark-framework/emulation-exp/code/kex/scripts/queries.py