Fix purge ctx references

jarvis/cogs/admin.py

@@ -80,7 +80,7 @@ class AdminCog(commands.Cog):
         await self._kick(ctx, user, reason)
 
     async def _purge(self, ctx, amount: int = 30):
-        channel = ctx.message.channel
+        channel = ctx.channel
         messages = []
         async for message in channel.history(limit=amount + 1):
             messages.append(message)
@@ -88,7 +88,7 @@ class AdminCog(commands.Cog):
         self.db.purges.insert_one(
             {
                 "channel": ctx.channel.id,
-                "guild": ctx.channel.guild.id,
+                "guild": ctx.guild.id,
                 "admin": ctx.author.id,
                 "count": amount,
                 "time": datetime.now(),