Visual issues with form fields in edit attachment modal

[tyxla]

There is a minor issue with the form fields in the edit attachment modal - their box-sizing is content-box (as inherited from .media-modal *), which makes them look awkward in some locations.

Steps to reproduce:

1. Go to Media
2. Click on an image attachment.
3. In the popup, below the image, click on the "Edit Image" button.
4. Take a look at all of the fields - they are larger than they should be (compared to the other media modals).

The issue can be observed best with the Apply changes to: radio buttons, where the checked circle is not in the middle, but a little off to the top & left.

As a solution we have to make sure that the box-sizing of the edit attachment modal input, select, media is border-box instead of content-box. This will fix the issue on both desktop and mobile devices.

[tyxla]

Fix the box-sizing of the input, textarea and select fields in the edit attachment frame.

[tyxla]

Screenshot of the issue - before & after the patch

[kalina_dimitrova89]

+1. I think this one should be included in 4.4. The current radio buttons (and checkboxes - if any) look awkward.

[obenland]

It looks like [29727] tried to fix that before. Not sure whether it broke again or if it was an oversight in the previous fix.

[obenland]

In 35699:

Media: Reset box-sizing for input elements in the entire media modal.

See [29727].

Props tyxla for initial patch.
Fixes #34556.