t!cookie : change between cookie modifiers you've owned

[Juli Z#7135]

Suggestion: Tatsu players should have the ability to change between the cookie modifiers that they've already purchased in the past. [T!cookie]

Reason: This should be implemented because there are times where people can want to give more or less cookies. 

Images: N/A

Username: Juli Z#7135

[lilcat#0001]

The follow suggestion has been implemented to allow specifying the number of cookies to send with t!cookie (name) (number), though it's not possible to permanently remove or refund a purchased multiplier.

https://community.tatsu.gg/topic/312-being-able-to-give-a-specific-number-of-cookies-by-having-a-multiplier/