[BUGFIX] Add upgrade wizard for backend user setting startModule

In #60633 the rewrite of the module menu was done but can lead
to an error if the backend user startModule is set
to help_aboutmodules. Check all backend users and update the
setting if needed.

Resolves: #61485
Releases: 6.3
Change-Id: Ib6f21c4bd4d4315e76cc7d51bebf08c9fa01b924
Reviewed-on: http://review.typo3.org/32692
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>