ns2: Fix incompatible VTY configs when writing config

It seems like we still don't have NS2 VTY tests running in libosmocore
so this only got caught once osmo-sgsn/osmo-gbproxy builds failed.

Change-Id: Id3cd407b05457a4703ee38c4b1b1b65800bbd30e
Related: OS#4887
diff --git a/src/gb/gprs_ns2_vty.c b/src/gb/gprs_ns2_vty.c
index 0a0a5d3..7a6b3ba 100644
--- a/src/gb/gprs_ns2_vty.c
+++ b/src/gb/gprs_ns2_vty.c
@@ -332,7 +332,7 @@
 			vty_out(vty, "  accept-ipaccess%s", VTY_NEWLINE);
 		if (vbind->dscp)
 			vty_out(vty, "  dscp %u%s", vbind->dscp, VTY_NEWLINE);
-		vty_out(vty, "   ip-sns signalling-weight %u data-weight %u%s",
+		vty_out(vty, "  ip-sns signalling-weight %u data-weight %u%s",
 			vbind->ip_sns_sig_weight, vbind->ip_sns_data_weight, VTY_NEWLINE);
 		break;
 	default: