removing extra slices from du configuration file

Signed-off-by: sagar arora <sagar.arora@openairinterface.org>

ci-scripts/conf_files/gnb-du.sa.band78.106prb.rfsim.conf

@@ -15,7 +15,7 @@ gNBs =
 
     // Tracking area code, 0x0000 and 0xfffe are reserved values
     tracking_area_code  =  1;
-    plmn_list = ({ mcc = 208; mnc = 99; mnc_length = 2; snssaiList = ({ sst = 1 }, { sst = 2 }, { sst = 3 } ) });
+    plmn_list = ({ mcc = 208; mnc = 99; mnc_length = 2; snssaiList = ({ sst = 1 }) });
 
 
     nr_cellid = 12345678L;