hotspots: Turn on hotspots for new users.

We need a migration to clear the tutorial_status for existing users,
so that we don't show hotspots to anyone who signed up for Zulip in
the month or so since we deleted the old tutorial.

static/js/ui_init.js

@@ -271,6 +271,7 @@ $(function () {
     drafts.initialize();
     sent_messages.initialize();
     compose.initialize();
+    hotspots.initialize();
     ui.initialize();
 });