Fix: time() being appended regardless of pre-existing file with same filename

[nxgcx]

Problem

It seems that regardless of a file existing or not, time() is appended to the filename, which it appears should only occur when the file does in fact exist.

Solution

• Copy over the way this conditional was handled in v2
• Convert $filename to a string for cases where it is equal to the return of Str::uuid(), to avoid Livewire throwing an exception about an invalid component property type if it does not have time() concatenated to it (effectively converting it to a string).

Testing

• Tested both local and S3 storage disk types with adding duplicates, with should_preserve_filenames = true
• Tested both local and S3 storage disk types with adding duplicates, with should_preserve_filenames = false

[awcodes]

Thanks.