gbproxy: Remove redundant part from config file

If a given setting is identical to the GBProxy_Tests.ttcn compile-time
default, we don't need to repeat it in the config file.

Change-Id: I3359f632eaf53bc602b1d10bb51de357f0eb2b45

gbproxy/GBProxy_Tests.fr.cfg

@@ -13,11 +13,6 @@
 
 [MODULE_PARAMETERS]
 GBProxy_Tests.mp_enable_bss_load_sharing := true;
-GBProxy_Tests.mp_nsconfig_sgsn := {
-	{
-		handle_sns := false
-	}
-}
 
 GBProxy_Tests.mp_nsconfig_pcu := {
 	{