Datatype fix for video preview delay

rocketbot/cogs/videopreviewcog.py

 	SETTING_DELAY = CogSetting(
 		'delay',
 		timedelta,
-		default_value=3,
+		default_value=timedelta(seconds=3),
 		brief='delay before attempting to fetch a preview',
 		description='How long to wait after a message is posted to see if Discord successfully loads a video preview',
+		min_value=timedelta(seconds=0),
+		max_value=timedelta(seconds=60)
 	)
 	SETTING_INSTAGRAM = CogSetting(
 		'instagram',
 
 	async def _wait_for_preview(self, message: Message, links: list[MessageLink]):
 		Self = VideoPreviewCog
-		delay: timedelta = self.get_guild_setting(message.guild, Self.SETTING_DELAY)
-		await asyncio.sleep(delay.total_seconds)
+		await asyncio.sleep(self.get_guild_setting(message.guild, Self.SETTING_DELAY))
 		# Look for embeds already showing the video
 		self.log(message.guild, "Checking message for embeds")
 		for embed in message.embeds: