Icon and edit link aren't on the same line anymore when editing single object

Steps to reproduce:

Open the object editor for a single object, like /xwiki/bin/edit/IconThemesCode/IconPickerMacro?editor=object&classname=XWiki.WikiMacroParameterClass&object=0&force=1

Expected result:

The pencil icon is on the same line as the link to editing all objects, here a screenshot from XWiki 16.4.4:

Actual result:

The pencil icon is on a separate line.