recent_topics: Don't revive focus when RT is not in focus.

When there is any overlay or popover open or user is focused on
any other input, we don't revive focus within recent topics.

Fixes #17875

frontend_tests/node_tests/hotkey.js

@@ -94,6 +94,7 @@ mock_esm("../../static/js/hotspots", {
 
 mock_esm("../../static/js/recent_topics", {
     is_visible: () => false,
+    is_in_focus: () => false,
 });
 
 message_lists.current = {