Fixed affected rows count

Signed-off-by: Juozas Kaziukenas <juozas@juokaz.com>

lib/Doctrine/DBAL/Driver/Sqlsrv/SqlsrvStatement.php

@@ -244,6 +244,6 @@ class SqlsrvStatement implements \Doctrine\DBAL\Driver\Statement
      */
     public function rowCount()
     {
-        return sqlsrv_num_rows($this->_sth);
+        return sqlsrv_rows_affected($this->_sth);
     }    
 }
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