Count the in-app conversations (locus ID) in the recent conversations

A conversation still needs to post a notification in order to be showing
in the recent conversations list. But couting the in-app conversations
will update their last usage timestamp whch affects the order of each
conversation in the list.

Bug: 162593584
Test: manual test + atest
Change-Id: I8ceeb4f39d525c9137abaf01bd54cd873cb07bde