'lists': Fix list_filter_shortcut not working

In presets/lists, the list_filter_shortcut (",A" by default) was
incorrectly written. This patch fixes this.

Author: mwnx

presets/lists

@@ -88,10 +88,9 @@ mutt.macro index ,,,l = \"$(list_move_macro "%id" "%box")\"
 #TODO: escape special characters (folder-hook expects a regex)
 MUTT.'folder-hook ' += $([[ %{mutt.mark_old:-} == no ]] ||\
                          printn "\"%{box}/\"/*" set mark_old)
-MUTT.'folder-hook ' += "\"%{box}/\"/*" bind index %list_filter_shortcut noop
 MUTT.'folder-hook ' += %{mutt.spoolfile} unset mark_old
-MUTT.'folder-hook ' += %{mutt.spoolfile} macro index %list_filter_shortcut push ",,,l"
-MUTT.'folder-hook ' += %{mutt.spoolfile} push ",,,l"
+MUTT.'folder-hook ' += %{mutt.spoolfile} push ,,,l
+mutt.macro index %list_filter_shortcut ?= "\"<enter-command><kill-line>push ,,,l<enter>\""
 
 [accounts %not_using_lists]
 mutt.bind index %list_filter_shortcut ?= noop