[BUGFIX] Old Fluid ViewHelper namespace in ext:about

Replace old namespace to the new namespace in Logo.html

Change-Id: Iadc6fa1e0397573974a399a18b2c3760887e3254
Fixes: #47898
Releases: 6.2
Reviewed-on: https://review.typo3.org/20476
Reviewed-by: Nicole Cordes
Reviewed-by: Stefan Froemken
Tested-by: Stefan Froemken
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn