[BUGFIX] Upgrade Wizards appear over and over again

The Upgrade Wizards "Check Compression Level" and
"Deprecated RTE properties" appear over and over again,
instead of hiding themselves after one execution.

Change-Id: I4d90abc7c88308b2f75dcc20ae4db52d0d383a10
Fixes: #31248
Releases: 4.6
Reviewed-on: http://review.typo3.org/6273
Reviewed-by: Xavier Perseguers
Tested-by: Xavier Perseguers
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Jigal van Hemert
Tested-by: Jigal van Hemert