Change persistent view example to use new setup_hook

examples/views/persistent.py

@@ -35,18 +35,16 @@ class PersistentViewBot(commands.Bot):
         intents.message_content = True
 
         super().__init__(command_prefix=commands.when_mentioned_or('$'), intents=intents)
-        self.persistent_views_added = False
 
-    async def on_ready(self):
-        if not self.persistent_views_added:
+    async def setup_hook(self) -> None:
         # Register the persistent view for listening here.
         # Note that this does not send the view to any message.
         # In order to do this you need to first send a message with the View, which is shown below.
         # If you have the message_id you can also pass it as a keyword argument, but for this example
         # we don't have one.
         self.add_view(PersistentView())
-            self.persistent_views_added = True
 
+    async def on_ready(self):
         print(f'Logged in as {self.user} (ID: {self.user.id})')
         print('------')