add shortcut for select next window

[alt-tab-macos-bot]

This issue was opened by a bot after a user submitted feedback through the in-app form.

From: wok-hush-overhear@duck.com

Message:

Please add the select next window item in shortcut when active. Of course, it is possible by trigger shortcut, but I wish I could select the next window and the previous window with different keys after using the trigger.