Ajaxify update cart button

This still needs work.

The file path in the patch was not right. I have corrected it.

We need to discuss about the solution because this patch takes care of single cart. It takes the carts and then filter and reset the carts array to get the single cart. And then work on it.

I am proposing a way to get the cart only from the cart id.

Will be uploading the patch with updated code.

Thanks

Uploading patch with the code that filters out the current cart from carts variable. Please review.

Thanks

This can be addressed in contrib, don't really want to introduce a change to existing sites without notice.