[BUGFIX] Show phpinfo() header title

This is a no-brainer, fixes the bug with the title of
phpinfo() in the Install Tool being hidden from CSS.

Change-Id: Ia4ff710c24ae4b2537f0cbcdf154b62cce080784
Fixes: #34686
Releases: 6.0, 4.7, 4.6, 4.5
Reviewed-on: http://review.typo3.org/10793
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn