Fix missing animation UI update in the Properties Editor

Animation indicators as well as decorators for properties were not
updating correctly in the following cases:
- NLA pushdown (this was reported in T87681)
- NLA enter/exit tweakmode
- Outliner unlinking/setting action

These actions all send a ND_NLA_ACTCHANGE notifier which the Properties
Editor was not listening to [which is now added].

part of T87681.

Maniphest Tasks: T87681

Differential Revision: https://developer.blender.org/D11040

source/blender/editors/space_buttons/space_buttons.c

@@ -811,6 +811,9 @@ static void buttons_area_listener(const wmSpaceTypeListenerParams *params)
       break;
     case NC_ANIMATION:
       switch (wmn->data) {
+        case ND_NLA_ACTCHANGE:
+          ED_area_tag_redraw(area);
+          break;
         case ND_KEYFRAME:
           if (ELEM(wmn->action, NA_EDITED, NA_ADDED, NA_REMOVED)) {
             ED_area_tag_redraw(area);