cast product id to number

[musta20]

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• Bug fix

What is the current behaviour? (You can also link to an open issue here)

• the product-card.js is not showing red heart when the product is in wishlist
• because the salla.storage.get('salla::wishlist', []) return array of integer number and the includes(this.product.id) is returning a string causing a mismatch bug the component fail to recognize the id in the array not sure if the error just in my themes .

What is the new behaviour? (You can also link to the ticket here)

• when the product is in wishlist the heart icon will be red

Does this PR introduce a breaking change?

Screenshots (If appropriate)