wc_cart_hash was used as a key for localStorage
for all WooCommerce sites. If you were to load your
cart for two different sites in the same browser,
the two WooCommerce pages would contend over this key
and loop on trying to set this key in the localStorage
This commit prepends the site's ajax URL onto the wc_cart_hash
key name in localStorage, providing a unique key for each
WooCommerce site. This ends contention over the keys.
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