[BUGFIX] Replace old @dontvalidate with @ignorevalidation

[BUGFIX] Replace old @dontvalidate with @ignorevalidation

@dontvalidate was syntax of the old propertymapper.

Change-Id: I50394d5272118253e4bb738adbed08054a6e1f64
Resolves: #71096
Releases: master, 6.2
Reviewed-on: https://review.typo3.org/44330
Reviewed-by: Andreas Bouche <andreas.bouche@flagbit.de>
Reviewed-by: Patrick Lobacher <patrick@lobacher.de>
Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Tested-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>