Allow to run Model::countBy method with uncached parameter

[Serhii-DV]

As a simple example, run this code in demo:

$intCount1 = \PageModel::countAll();
\Database::getInstance()->query("DELETE `tl_page` WHERE `id`=2");
$intCount2 = \PageModel::countAll();

You will see that $intCount1 === $intCount2. But should be $intCount1 > $intCount2.

[leofeyer]

Fixed in aacbe4e.