Fix: KeyingSetsAll RNA path incomplete/wrong

While working on !125365, I was running over a couple of places where
RNA paths were also incomplete in the UI.

This PR covers:
- KeyingSetsAll

Pull Request: https://projects.blender.org/blender/blender/pulls/125412

source/blender/makesrna/intern/rna_scene.cc

@@ -2364,6 +2364,11 @@ static void rna_TimeLine_clear(Scene *scene)
   WM_main_add_notifier(NC_ANIMATION | ND_MARKERS, nullptr);
 }
 
+static std::optional<std::string> rna_Scene_KeyingsSetsAll_path(const PointerRNA * /*ptr*/)
+{
+  return "keying_sets_all";
+}
+
 static KeyingSet *rna_Scene_keying_set_new(Scene *sce,
                                            ReportList *reports,
                                            const char idname[],
@@ -7641,6 +7646,7 @@ static void rna_def_scene_keying_sets_all(BlenderRNA *brna, PropertyRNA *cprop)
   RNA_def_property_srna(cprop, "KeyingSetsAll");
   srna = RNA_def_struct(brna, "KeyingSetsAll", nullptr);
   RNA_def_struct_sdna(srna, "Scene");
+  RNA_def_struct_path_func(srna, "rna_Scene_KeyingsSetsAll_path");
   RNA_def_struct_ui_text(srna, "Keying Sets All", "All available keying sets");
 
   /* NOTE: no add/remove available here, without screwing up this amalgamated list... */