chore: Enable Walker list cycling (#709)

Enable the `cycle` behaviour for Walker lists; this allows one to
quickly jump from the default-selected first item in a list, to the
last item, simply by pressing the "up" arrow key (or other key
sequence bound to "previous").

Refs: https://github.com/abenz1267/walker/wiki/Basic-Configuration

config/walker/config.toml

@@ -10,6 +10,7 @@ run_last_response = ["ctrl e"]
 
 [list]
 max_entries = 200
+cycle = true
 
 [search]
 placeholder = " Search..."