use n_TimingAdvanceOffset according to what set in the RU for FDD CI test with COTS UE

ci-scripts/conf_files/gnb-du.sa.band1.52prb.usrpb210.conf

@@ -118,7 +118,8 @@ gNBs =
         pucchGroupHopping                                              = 0;
         hoppingId                                                      = 40;
         p0_nominal                                                     = -70;
-        n_TimingAdvanceOffset                                          = 0;
+        # TimingAdvanceOffset_n25600
+        n_TimingAdvanceOffset                                          = 1;
 
       ssb_PositionsInBurst_Bitmap                                      = 1;