WooCommerce Product Add-Ons 6.8.2

* Fix - Quantity based price calculations were being performed on flat fee addons.
* Fix - Subtotals were hidden on non-bookable products if the bookings addon was active when selecting addons.

* Fix - Decode currency character correctly to support all WooCommerce currencies.
* Fix - Product page displaying incorrect price for per-person and per-block addons with WooCommerce Bookings.
* Fix - Handle option descriptions with value '0'.
* Fix - Numeric option descriptions are displaying incorrectly.
* Fix - Price update pushes "Add to Cart" button out of the way.

* Fix - Ensure prices are displayed correctly on the frontend when using a comma as decimal separator.