Add a tick on traceback command when it's sent to DMs (#5353)

* add a `tick` when sent to dm.

* confused ™️

* did i learn now? :P

* i'm not confused anymore :3

redbot/core/core_commands.py

@@ -1469,6 +1469,8 @@ class Core(commands.commands._RuleDropper, commands.Cog, CoreLogic):
                         "Either you blocked me or you disabled DMs in this server."
                     )
                     return
+            if not public:
+                await ctx.tick()
         else:
             await ctx.send(_("No exception has occurred yet."))