fix (renting): Disallow removing owner.

Don't allow the room owner to be added or removed from the rented room.
Also fixes an issue where the room expiry log would try to use deleted data.

bot/modules/renting/rooms.py

@@ -187,14 +187,14 @@ class Room:
             except discord.HTTPException:
                 pass
 
-        # Delete the room from data (cascades to member deletion)
-        self.delete()
-
         guild_settings.event_log.log(
             title="Private study room expired!",
             description="<@{}>'s private study room expired.".format(self.data.ownerid)
         )
 
+        # Delete the room from data (cascades to member deletion)
+        self.delete()
+
     async def add_members(self, *members):
         guild_settings = GuildSettings(self.data.guildid)