Making sure other people can't close help embed

cogs/help/help.py

@@ -261,6 +261,14 @@ class HelpMenu(menus.Menu):
 
     @menus.button('\N{BLACK SQUARE FOR STOP}\ufe0f')
     async def on_stop(self, payload):
+
+        # Simple check to make sure that the reaction is performed by the user
+        def check(m):
+            return m.author == payload.member
+
+        if not check(self.ctx):
+            return
+        else:
             # Send the stop embed which shows that the help commands embed is no longer accessible
             stop = stop_embed(self)
             await self.message.edit(embed=stop)