MT#59249 invite_reinvite_transcoding: set transcode prefs for peer

Also set the transcode preferences for the peering,
since it has other domain from the local subscriber,
but by the scenario check has to get the PCMA.

Change-Id: I35501b3a10351af7fddbc227a4ff34628bf171ce

scenarios/invite_reinvite_transcoding/prefs.json.tt2

@@ -2,5 +2,8 @@
     "@invite-reinvite-transcoding.scenarios.test": {
         "nat_sipping": "no",
         "transcode_PCMA": true
+    },
+    "peer_invite_reinvite_transcoding_host0": {
+        "transcode_PCMA": true
     }
 }