[BUGFIX] Fix weirdness field wizard

The wizard of the weirdness field does not work
as the field is not marked as changed when
pressing the + or - buttons

Because of that the field value is not saved
when only using this wizard.

Change-Id: I13fac3ea68782bf120bf48703e2f3861f55e55ec
Resolves: #56461
Releases: 0.6
Reviewed-on: https://review.typo3.org/27967
Reviewed-by: Francois Suter
Tested-by: Francois Suter