Revert "Remove global updateInbox method"

This reverts commit 1c70293bba.

This broke tests by blocking the database deletion during test
setup.

js/conversation_controller.js

@@ -37,9 +37,6 @@
         }
     }))();
 
-    // Load the initial set of models for the inbox.
-    conversations.fetchActive();
-
     window.getInboxCollection = function() {
         return inboxCollection;
     };
@@ -71,6 +68,9 @@
                     }
                 });
             });
+        },
+        updateInbox: function() {
+            conversations.fetchActive();
         }
     };
 })();