Fix default duration value

Author: Lpsd

forward/forward.py

@@ -250,7 +250,7 @@ async def tblock(self, ctx, user: discord.Member, time: Optional[MuteTime] = Non
         async with self.config.blocked() as blocked:
             userid = str(user.id)
             if userid not in blocked:
-                duration = time.get("duration") if time else MuteTime("5d").get("duration")
+                duration = time.get("duration") if time else MuteTime().convert("5d").get("duration")
                 blocked[userid] = (datetime.now(timezone.utc) + duration).timestamp() # until
                 await ctx.maybe_send_embed("Blocked <@{id}> from send messages to the bot until {until}.".format(id=userid, until=datetime.fromtimestamp(blocked[userid])))
             else: