Fix the toggleCartItemQuanitity bug

[Skyleen77]

When incrementing or decrementing the targeted item went below the list.
So I removed the filter method. I cloned cartItems in newCardItems and I map this newCardItems, in the if and the else, to add the quantity to it.
Finally, I set it in setCartItems.

[vercel]

Someone is attempting to deploy a commit to a Personal Account owned by @adrianhajdin on Vercel.

@adrianhajdin first needs to authorize it.

[georgi9603]

Nice job I would add check if ids are equal to return new item otherwise the old one:

const newCartItems = cartItems.map((item) =>
item._id === id
? { ...item, quantity: productToUpdate.quantity + 1 }
: item
);

setCartItems([...newCartItems]);

[Skyleen77]

You are right it's important to add verification, good job, thank you!

[ojongfalon]

This works perfectly.
Thank you :)