will no longer be activated once persistFilterActivationState() is
called

When restoring the filters, add "visibleInUi=false;activeByDefault=true"
filters to the active filter. After that handle all "visibleInUi=true"
filters by checking the preferences or add all of them in case the
preference key does not exist.

Change-Id: I1b892607809dd1e2e9ab21818f55b9938e15d771
Signed-off-by: Martin SCHREIBER <m.schreiber@bachmann.info>