Divs in the container-inline wrapper should be inline-block instead of inline

Problem/Motivation

When you have a div in a fieldset with the class container inline all divs and labels get a display: inline.
On divs this breaks some style like margin and padding.

Proposed resolution

The proposed resolution applies the supplied patch to all divs that have the class .container-inline and sets the display style to inline-block.

Remaining tasks

From comment #5:
Search through core files to find instances of "container-inline" to find where this markup is used. Then take screenshots of as many of these instances as possible to make sure we are not visually breaking anything with this change.

Original report by @Oostie

When you have a div in a fieldset with the class container inline all divs and labels get a display: inline.
On divs this breaks some style like margin and padding.

This patch sets inline-block on divs.