[spiral/pagination] Paginator doesn't calculate countPages correctly in constructor

[gam6itko]

Description

The current implementation of the Paginator class has an issue in the constructor when we pass the $count argument. The problem is with the $countPages property which should be calculated based on the $count property, but it doesn't. This can cause incorrect pagination calculations.

Steps to Reproduce:

Create an instance of the Paginator class with a non-zero count argument

$paginator = new Paginator(limit: 25, count: 100);

Expected Result:

The countPages property should be calculated based on the count property and return the correct value.

$this->assertSame(100, $paginator->count());
$this->assertSame(4, $paginator->countPages());

[butschster]

Fixed