hnbgw: fix PLMN in g_hnb_cfg

To get 001-01, we need to encode the placeholder 0xf nibble.

Since recently, osmo-hnbgw cares about the PLMN in messages, in specific
cases: in upcoming CN pool tests, the PLMN is part of the algorithm that
picks the CN link. So let's encode 001-01 correctly.

Change-Id: I5299c521479dc25ea0f82d7d294d53942960d2cf

hnbgw/HNBGW_Tests.ttcn

@@ -337,7 +337,7 @@ function f_init(charstring id := "HNBGW", float guard_timeout := 30.0) runs on t
 	for (var integer i := 0; i < g_num_hnbs; i := i+1) {
 		g_hnb_cfg[i] := {
 			lai := {
-				mcc_mnc := '00101'H,
+				mcc_mnc := '00F110'H,
 				lac := 2342 + i
 			},
 			sac := 55