Fix _addUrlRewrite() ignoring collection store scope. (#510)

While Mage_Catalog_Model_Resource_Product_Collection::addUrlRewrite()
does respect any set storeId on the collection it's helper that does
the actual work is hard-coded to the current active store.

app/code/core/Mage/Catalog/Model/Resource/Product/Collection.php

@@ -1175,7 +1175,7 @@ protected function _addUrlRewrite()
             }
 
             $select = $this->_factory->getProductUrlRewriteHelper()
-                ->getTableSelect($productIds, $this->_urlRewriteCategory, Mage::app()->getStore()->getId());
+                ->getTableSelect($productIds, $this->_urlRewriteCategory, Mage::app()->getStore($this->getStoreId())->getId());
 
             $urlRewrites = array();
             foreach ($this->getConnection()->fetchAll($select) as $row) {