fixed signal level computation for PUCCH2 and threshold in pucchsim.

Threshold allows detection with -9 dB SNR with 8 RX antennas

openair1/SIMULATION/NR_PHY/pucchsim.c

@@ -145,7 +145,7 @@ int main(int argc, char **argv)
   //unsigned char frame_type = 0;
   int loglvl=OAILOG_WARNING;
   int sr_flag = 0;
-  int pucch_DTX_thres = 50;
+  int pucch_DTX_thres = 0;
   cpuf = get_cpu_freq_GHz();
 
   if ((uniqCfg = load_configmodule(argc, argv, CONFIG_ENABLECMDLINEONLY)) == 0) {