[product_category] shortcode: Remove ordering query args

When using the `[product_category]` shortcode with orderby arguments of 'popularity' or 'rating' the `orderby` query clauses are affected for the remaining WP_Queries on the page.

There are many ways to duplicate the issue, but one would be to use the shortcode on the same page as the Recently Viewed widget and you will notice a database error where the widget should be.