Fixes problem when paginator doesn't calculate countPages correctly in constructor

[butschster]

Q	A
Bugfix?	✔️
Breaks BC?	❌
New feature?	❌
Issues	#900

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. To solve this issue, I have updated the Paginator constructor to invoke the setCount method with the $count argument, ensuring that the $countPages property is recalculated correctly.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (0f2b962) 84.76% compared to head (3c124bb) 84.76%.

❗ Current head 3c124bb differs from pull request most recent head 14842b5. Consider uploading reports for the commit 14842b5 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #928   +/-   ##
=========================================
  Coverage     84.76%   84.76%           
  Complexity     5852     5852           
=========================================
  Files           764      764           
  Lines         16572    16572           
=========================================
  Hits          14047    14047           
  Misses         2525     2525           

Impacted Files	Coverage Δ
src/Pagination/src/Paginator.php	86.79% <100.00%> (ø)

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