[BUGFIX] Indexed search: do not double encode links

Prevent double htmlspecialchars encoding of the link titles
in Extbase plugin

Resolves: #71623
Releases: master, 7.6
Change-Id: If6e9bc2127ca41bc5d728ffeaca8d12f65061ed2
Reviewed-on: https://review.typo3.org/45219


Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>