Also keep 2 for compatibility reasons.

Change-Id: I22e775e6c46e5f48e2de40560e7ebad063fd7942
Signed-off-by: Lars Vogel <Lars.Vogel@vogella.com>
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.ui/+/187395
Tested-by: Platform Bot <platform-bot@eclipse.org>
Reviewed-by: Sebastian Ratz <sebastian.ratz@sap.com>