In the "Clean Ups" dialog, when the "Replace system property with
constant" cleanup is disabled, the preview is wrong for the checked
properties.

In addition, the order in the preview should be the same as the order of
the checkboxes.

Change-Id: I6ecb15f298c0d9042211d6da66667652ca973367
Signed-off-by: Holger Voormann <eclipse@voormann.de>
Reviewed-on: https://git.eclipse.org/r/c/jdt/eclipse.jdt.ui/+/181160
Reviewed-by: Carsten Hammer <carsten.hammer@t-online.de>
Reviewed-by: Fabrice Tiercelin <fabrice.tiercelin@yahoo.fr>
Tested-by: JDT Bot <jdt-bot@eclipse.org>