update telegram empty-command registration expectation

Author: casama233

tests/test_telegram_adapter.py

@@ -472,7 +472,7 @@ async def second_start_polling(*args, **kwargs):
 
     assert builder.build.call_count == 2
     app_one.updater.stop.assert_awaited()
-    app_one.bot.delete_my_commands.assert_not_awaited()
+    app_one.bot.delete_my_commands.assert_awaited_once()
     app_one.stop.assert_awaited()
     app_one.shutdown.assert_awaited()
     app_two.initialize.assert_awaited()