Underline inline links on the doc renaming page

Highlighted by automated WCAG tests.
Two links in the page rename form are not highlighted while inline (wiht the proper option). This causes some link-contrast violations being reported.

Example of automated report:

```
Validation in the test method [renamePageWithUsedClass]
Check for [org.xwiki.test.ui.po.RenamePage] at http://xwikiweb:8080/xwiki/bin/view/NestedRenamePageIT/renamePageWithUsedClass/?xpage=rename&step=1.
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/view/NestedRenamePageIT/renamePageWithUsedClass/?viewer=children&displayHidden=true">3 child pages</a>
Selector: [dd:nth-child(4) > .xHint > a]
Fix any of the following:
The link has insufficient color contrast of 1.41:1 with the surrounding text. (Minimum contrast is 3:1, link text: #2f70a7, surrounding text: #555555)
The link has no styling (such as underline) to distinguish it from the surrounding text

HTML element:
<a href="/xwiki/bin/view/NestedRenamePageIT/renamePageWithUsedClass/?viewer=backlinks">0 incoming links</a>
Selector: [dd:nth-child(6) > .xHint > a]
Fix any of the following:
The link has insufficient color contrast of 1.41:1 with the surrounding text. (Minimum contrast is 3:1, link text: #2f70a7, surrounding text: #555555)
The link has no styling (such as underline) to distinguish it from the surrounding text
```