[BUGFIX] Show nav title in element browser

Show the nav title instead of the page title in the element browser
(f.e. in the link wizard), if the user TSconfig setting
"options.pageTree.showNavTitle=1" is set.

Resolves: #71625
Related: #64492
Releases: master
Change-Id: Id6721edf9741d05596342f0fee920cf8068e1354
Reviewed-on: https://review.typo3.org/44747


Reviewed-by: Marco Huber <mail@marco-huber.de>
Tested-by: Marco Huber <mail@marco-huber.de>
Tested-by: Gianluigi Martino <gmartino27@gmail.com>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>