In `image_size_input_fields()`:

* Declare `$out` as an empty array - this is not a strict PHP requirement, but is a good practice before loops
* Most of this function was tabbed twice, instead of once

See #30799.


git-svn-id: https://develop.svn.wordpress.org/trunk@30981 602fd350-edb4-49c9-b593-d223f7449a82