Prevent implicit conversion from float to int in FileSizeOptimizedWidthCalculator

[QuentinGab]

Hi,

Super simple PR to prevent implicit conversion from float to int and so, prevent a warning to be log.
Example of a warning:

Implicit conversion from float 7616.5962599999975 to int loses precision in ...\vendor\spatie\laravel-medialibrary\src\ResponsiveImages\WidthCalculator\FileSizeOptimizedWidthCalculator.php on line 46

[freekmurze]

Thanks!

[boryn]

Good, it's finally solved, but IMHO solution presented here #3030 would be better - that is accepting float at finishedCalculating() instead of (int) casting the $predictedFileSize