Filtering view does not give information that it is filtered

[hrw@…]

When I used searchbar to filter list of contacts there is no info that I have
filtered view on screen. Can be annoying if I will go back to contacts after
some time.

[chris@…]

I think that when toggling the filter back to the category-picker that the
filter should be cleared (this is how it behaves in openmoko-dates and
openmoko-today).

If you're using the filter, likelihood is you're searching for a particular
contact, if you're looking for a group of people you'd have used the group
picker; using both at once is an unlikely necessity that complicates the
majority of simpler cases (imo).

[thomas@…]

I've now implemented the behaviour described by Chris.