[TASK] Unify donate button in about module

Change-Id: Iaf58bdb62fb9929af05398cc0d3f6a9f31c7cad4
Resolves: #47933
Releases: 6.2
Reviewed-on: https://review.typo3.org/20503
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn