Only display MOTD in ASGI on startup (#2349)

sanic/app.py

@@ -1728,7 +1728,8 @@ class Sanic(BaseSanic, metaclass=TouchUpMeta):
         details: https://asgi.readthedocs.io/en/latest
         """
         self.asgi = True
-        self.motd("")
+        if scope["type"] == "lifespan":
+            self.motd("")
         self._asgi_app = await ASGIApp.create(self, scope, receive, send)
         asgi_app = self._asgi_app
         await asgi_app()