... using the Java Build Path properties.

Fixed regression introduced via
https://github.com/eclipse-platform/eclipse.platform.ui/pull/243/ in
4.25.

The default wizard modality was changed from SWT.APPLICATION_MODAL to
SWT.PRIMARY_MODAL. This seem to break nested modal dialog opened from
the Java Build Path property page on Mac and Windows because the dialog
used wrong parent.

Fixes https://github.com/eclipse-jdt/eclipse.jdt.ui/issues/557