Missing an underline for the "edit this page" link

When looking for an unexisting page, the link edit to create is not underlined while inline.
This inconsistency arose after the merge of XWIKI-21492.

This is one of the major causes left for link underlining automated errors.

WCAG warnings in the test class [org.xwiki.administration.test.ui.AllIT]:
__________
Validation in the test method [registerJohnSmith]
Check for [org.xwiki.test.ui.po.DeletePageOutcomePage] at http://xwikiweb:8080/xwiki/bin/view/XWiki/RegistrationConfig.
Found [1] items

1: Links must be distinguishable without relying on color
Description: Ensure links are distinguished from surrounding text in a way that does not rely on color
Help URL: https://dequeuniversity.com/rules/axe/4.8/link-in-text-block?application=axeAPI
Help: Links must be distinguishable without relying on color
Impact: serious
Tags: cat.color, wcag2a, wcag141, TTv5, TT13.a, EN-301-549, EN-9.1.4.1

HTML element:
<a href="/xwiki/bin/create/XWiki/RegistrationConfig/WebHome">edit this page</a>
Selector: [.panel-body > a]
Fix any of the following:
The link has insufficient color contrast of 2.4:1 with the surrounding text. (Minimum contrast is 3:1, link text: #2f70a7, surrounding text: #333333)
The link has no styling (such as underline) to distinguish it from the surrounding text