[BUGFIX] Double escape of title in indexed search

SearchController::compileSingleResultRow() causes double
htmlspecialchars() call on $title.

This patch removes the general htmlspecialchars() call since
$title will be escaped in linkPage() anyway.
The only place which requires escaping has the call added now.

Resolves: #56262
Releases: 6.2, 6.1, 6.0
Change-Id: Ic94fe7fe7d2145fc539adcdf21faf42c33f5b32e
Reviewed-on: https://review.typo3.org/27999
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters