The only call of the PackageAdmin was false because it got the Bundle
from the host/the running platform. Furthermore the preceding code
always fails because PlatformAdmin implementation in use does not
support add/removeDisabledInfo anymore.

Change-Id: I29c158bcae8754666524086083e8b8909457ec76
Signed-off-by: Hannes Wellmann <wellmann.hannes1@gmx.net>
Reviewed-on: https://git.eclipse.org/r/c/pde/eclipse.pde.ui/+/191977
Tested-by: PDE Bot <pde-bot@eclipse.org>