Problem with Zend_Paginator and group by in query

Hi guys,

Zend_Paginator has a serious error when using group by in query. He loses himself by counting the lines.
Simples solution: reset count after cloning query.

```
// Zend/Paginator/Adapter/DbSelect.php:207
$rowCount = clone $this->_select;
$rowCount->__toString(); // Workaround for ZF-3719 and related
$rowCount->reset(Zend_Db_Select::LIMIT_COUNT); // <--- this
```
