amarisoft_enb: Properly set S1AP SCTP bind ip addr

Change-Id: I8e2b8609cb198c6d5e293cffaa0a9de99600f06d
diff --git a/src/osmo_gsm_tester/templates/amarisoft_enb.cfg.tmpl b/src/osmo_gsm_tester/templates/amarisoft_enb.cfg.tmpl
index 8bb55d3..5690da9 100644
--- a/src/osmo_gsm_tester/templates/amarisoft_enb.cfg.tmpl
+++ b/src/osmo_gsm_tester/templates/amarisoft_enb.cfg.tmpl
@@ -41,6 +41,7 @@
 
   mme_list: [
     {
+      s1ap_bind_addr: "${enb.addr}",
       /* address of MME for S1AP connection. Must be modified if the MME
          runs on a different host. */
       mme_addr: "${enb.mme_addr}",