[BUGFIX] Removed configuration field from be_dashboards records

As the database column for the field configuration is missing
and the field is not used anymore, the TCA configuration for
this field is removed.

Resolves: #90687
Releases: master
Change-Id: I4510419deebf1183eaaabcc2a6078f126a8d58f5
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63636


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>