Contacts are now in status-go, no migration of contacts is provided so
all contacts will be lost upon installing this build.
I have left the initialization of filters a bit sketchy (we wait that
load-filters is called twice), as the next step will be to avoid calling
load-filters altogether, as now that both contacts & chats are in
status-go, there's no reason to call it from status-react, and can be
called directly from status-go on loading.
Signed-off-by: Andrea Maria Piana <andrea.maria.piana@gmail.com>