Steps to reproduce

In XWIKI-21600 were fixed a few modals that do not use the icon theme, but hard coded `x` or multiplication symbols.

1. Edit a page with CKEditor
2. From Toolbar, click on 'Link' button
3. Click on 'Select a page' button
4. Observe the close button on 'Select Page' modal on the upper right

Expected results

The close button uses an icon (which appears bolder than the current close button).

Actual results

The button is still displayed on the old style.