Fix T69522: Render Region not refreshing Output Properties

setting/clearing render region uses ND_RENDER_OPTIONS notifier, but
listener was only refreshing RENDER and VIEWLAYER tabs in that case,
whereas the render region buttons are located in OUTPUT tab.

Reviewers: billreynish

Maniphest Tasks: T69522

Differential Revision: https://developer.blender.org/D5685

source/blender/editors/space_buttons/space_buttons.c

@@ -364,6 +364,7 @@ static void buttons_area_listener(wmWindow *UNUSED(win),
       switch (wmn->data) {
         case ND_RENDER_OPTIONS:
           buttons_area_redraw(sa, BCONTEXT_RENDER);
+          buttons_area_redraw(sa, BCONTEXT_OUTPUT);
           buttons_area_redraw(sa, BCONTEXT_VIEW_LAYER);
           break;
         case ND_WORLD: