[TASK] Remove empty row in table below header

Info>Pagetree overview: Remove empty row in table
below header.
remove also unused property widthGif

Resolves: #63216
Releases: master
Change-Id: I6ecb3b47791c75ca7c61ef2130ec2541fcdb28ae
Reviewed-on: http://review.typo3.org/34500
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>