tweaks: Update setting defaults.

`video_grace_period` now 90 seconds.
`task_limit` now 99.
`rent_member_limit` now 24.

Also updated `Integer` default `_min` and `_max` to match DB values.

bot/modules/moderation/video/admin.py

@@ -107,7 +107,7 @@ class video_grace_period(settings.Duration, GuildSetting):
         "before they will be kicked from the channel, and warned or studybanned (if enabled)."
     )
 
-    _default = 45
+    _default = 90
     _default_multiplier = 1
 
     @classmethod