Show destination address in MO SHORT MESSAGE CONTROL summaries

- _build_summary: append 'DA <tp_da>' after the SMSC part for the
  MO SHORT MESSAGE CONTROL envelope (the envelope decoder already
  stores the second address TLV as cmd.tp_da; the detail view already
  showed it)
- test: constructed D5 envelope with SMSC + destination address
- Backend-only, no version bump

simtrace2_pysniff/server/decode.py

@@ -3744,6 +3744,8 @@ def _build_summary(result):
             parts.append(cmd['text'])
         if cmd.get('smsc'):
             parts.append(f"SMSC {cmd['smsc']}")
+        if cmd.get('tp_da'):
+            parts.append(f"DA {cmd['tp_da']}")
         if cmd.get('events'):
             parts.append(', '.join(cmd['events']))
         if cmd.get('address'):