Hide 'Always underline links' option

This is a fingerprinting vector as outline din #42243

We will hide for 14.0 and fix the underlying issue in 14.5.

added 14.0 stable Desktop Feature Next labels

assigned to @henry

added Fingerprinting label

removed Next label

added Doing label

mentioned in merge request !1180 (merged)

marked this issue as related to tor-browser-build#41225 (closed)

marked this issue as related to tor-browser-build#41226 (closed)

closed

marked this issue as related to #42243