[BUGFIX] Fix wrong field name in be_dashboard TCA

The TCA for be_dashboard was using a field name that doesn't exist
in the database table.

Resolves: #90477
Releases: master
Change-Id: Icb78d89a723d0d1030bf31d0645c0f31592a67e2
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63360


Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Tested-by: TYPO3com <noreply@typo3.com>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>