Round Discounts to 1 decimal

Round discount amounts to one decimal place.

// Round discount to 1 decimal by using woocommerce round discount function and it may be round half down (1.5 into 1)
add_filter('advanced_woo_discount_rules_discount_prices_of_product', function ($discount_prices, $product, $quantity, $cart_item){
    if (function_exists('wc_round_discount') && function_exists('wc_get_price_decimals')) {
        $precision = 1;
        if(isset($discount_prices['discounted_price'])){
            $discount_prices['discounted_price'] = wc_round_discount($discount_prices['discounted_price'], $precision);
        }
        if(isset($discount_prices['discounted_price_with_tax'])){
            $discount_prices['discounted_price_with_tax'] = wc_round_discount($discount_prices['discounted_price_with_tax'], $precision);
        }
        if(isset($discount_prices['discount_lines'])){
            foreach ($discount_prices['discount_lines'] as $key => $value){
                if($key !== 'non_applied'){
                    $line_discount = $discount_prices['discount_lines'][$key]['discounted_price'];
                    $discount_prices['discount_lines'][$key]['discounted_price'] = wc_round_discount($line_discount, $precision);
                }
            }
        }
    }
    return $discount_prices;
}, 10, 4);