Fix pricing when using with&without tax with customer groups

When using prices with and without taxes, there are
multiple entries in the $fields array. When looping through
the groups $product->getPriceModel()->getFinalPrice() is
called for each group. This sets the data['final_price'] on
the product model each time it is called.

This means that on the second loop of the field array,
when the call to set $special_price uses $product->getFinalPrice()
it is getting value set for the final group in the previous
iteration.

This patch changes the assignment of special_price to recalculate
the final_price everytime, it also moves it out of the currency
loop because the result doesn't depend on the currency.

(cherry picked from commit 77dad50c58c81b6e95772230bad89e05b60c9b2e)

app/code/community/Algolia/Algoliasearch/Helper/Entity/Producthelper.php

@@ -528,21 +528,21 @@ protected function handlePrice(Mage_Catalog_Model_Product &$product, $sub_produc
 
         foreach ($fields as $field => $with_tax) {
             $customData[$field] = array();
+            $field_price = (double) $taxHelper->getPrice($product, $product->getPrice(), $with_tax, null, null, null, $product->getStore(), null);
+            $field_special_price = (double) $taxHelper->getPrice($product, $product->getPriceModel()->getFinalPrice(1, $product), $with_tax, null, null, null, $product->getStore(), null);
 
             foreach ($currencies as $currency_code) {
                 $customData[$field][$currency_code] = array();
 
-                $price = (double) $taxHelper->getPrice($product, $product->getPrice(), $with_tax, null, null, null, $product->getStore(), null);
-                $price = $directoryHelper->currencyConvert($price, $baseCurrencyCode, $currency_code);
+                $price = $directoryHelper->currencyConvert($field_price, $baseCurrencyCode, $currency_code);
                 $price += $weeeTaxAmount;
 
+                $special_price = $directoryHelper->currencyConvert($field_special_price, $baseCurrencyCode, $currency_code);
+                $special_price += $weeeTaxAmount;
+
                 $customData[$field][$currency_code]['default'] = $price;
                 $customData[$field][$currency_code]['default_formated'] = $this->formatPrice($price, false, $currency_code);
 
-                $special_price = (double) $taxHelper->getPrice($product, $product->getFinalPrice(), $with_tax, null, null, null, $product->getStore(), null);
-                $special_price = $directoryHelper->currencyConvert($special_price, $baseCurrencyCode, $currency_code);
-                $special_price += $weeeTaxAmount;
-
                 if ($customer_groups_enabled) {
                     // If fetch special price for groups