[TASK] Optimize topbar logo link

This patch fixes the clickable area of the topbar logo link.

Furthermore, the logo link of topbar header leads to the user's startup
module instead of typo3.org.

Resolves: #78393
Releases: master
Change-Id: I5bfaf72f497a0b7b09a69114bde115e90f243de1
Reviewed-on: https://review.typo3.org/50395


Reviewed-by: Bjoern Jacob <bjoern.jacob@tritum.de>
Tested-by: Bjoern Jacob <bjoern.jacob@tritum.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Tested-by: Daniel Lorenz <info@extco.de>
Reviewed-by: Daniel Lorenz <info@extco.de>
Reviewed-by: Marc Willmann <mw@f7.de>
Tested-by: Marc Willmann <mw@f7.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>