CI: updating also ci conf file

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

ci-scripts/conf_files/gnb.band78.tm1.106PRB.usrpn300.conf

@@ -245,7 +245,7 @@ RUs = (
          att_rx         = 0;
          bands          = [7];
          max_pdschReferenceSignalPower = -27;
-         max_rxgain                    = 114;
+         max_rxgain                    = 75;
          eNB_instances  = [0];
          #beamforming 1x4 matrix:
          bf_weights = [0x00007fff, 0x0000, 0x0000, 0x0000];