[Narrative theme] Send straight to checkout from cart drawer

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Hi there, 

on our shop roykombucha.com we use Narrative as the theme and have added a lot of custom code over the last two years. 

One problem I have is that the cart drawer checkout doesn't lead to checkout automatically, but sends customers to the full cart page again. I know that newer versions of the Narrative theme have this fixed, but don't want to update as I would have to edit a lot of code. 

How can I change this in my older code base? I compared the cart-drawer.liquid files and they look exactly the same, but I'm not that experienced in Shopify coding in general.

Thanks for your help!