Nested uploaded files parsed wrong in 1.8.0

[aimeos]

There's a problem in 1.8.0 with nested file uploads for e.g.:

<input type="file" name="image[0][file]" />

Then, createUploadedFile() is called with that array:

Array (
	[image] => Array (
		[name] => Array ( [0] => Array ( [file] => admin-product-detail.png ) )
		[type] => Array ( [0] => Array ( [file] => image/png ) )
		[tmp_name] => Array ( [0] => Array ( [file] => /tmp/php9tIgbR ) )
		[error] => Array ( [0] => Array ( [file] => 0 ) )
		[size] => Array ( [0] => Array ( [file] => 83760 ) ) 
	) 
)

In version 1.7.2 nested files are correctly parsed

[precariouspanther]

Noticed this too - diactoros is allowing single dimension arrays of files (i.e image[0]) and named indexes (i.e image[my-image]) but not multi-dimensional arrays (i.e image[0][file], image[slide][0][image][4]) which are legal names for file upload elements.

[precariouspanther]

Candidate fix PR here: #312