Remove temporary solution for comparing BLOBS
Due to an error in Doctrine (https://github.com/doctrine/dbal/issues/2663) a comparison of changes in
the BLOB datatype cannot be detected. Since the new session framework needs this changes - a
temporary workaround has been made via https://forge.typo3.org/issues/79722.
As soon as this has been fixed in Doctrine this workaround must be removed again.