integration fix: fix crash
With value 4 when connecting one UE and doing some downlink iperf TCP there is a crash. Probably due to the multiple wrong RA detected leading to uplink failure of fake UE that never sends Msg3 (because, well, there is no other UE). This is another problem that will be fixed at some point. Anyway, this value 4 fails. Let's put back 3.
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