Fix double root issue

[rojtjo]

I have a filesystem (S3) configured with a custom root set to public which means any file I put or get from that filesystem will get prefixed with public/. In the Uploader class it attempts to read the contents of my upload by using the Storage facade and by getting the path by using $file->path() but this actually returns the prefixed path.

So $file->path() returns public/livewire-tmp/foo.png which means when I attempt to read that file from my filesystem it actually looks for the file public/public/livewire-tmp/foo.png in my S3 bucket resulting in an error.

Livewire actually provides a get() method on the TemporaryUploadedFile class which solves this exact issue.