Cleanup: Use const for asset catalog query

source/blender/asset_system/intern/asset_library_all.cc

@@ -67,7 +67,7 @@ void AllAssetLibrary::tag_catalogs_dirty()
   catalogs_dirty_ = true;
 }
 
-bool AllAssetLibrary::is_catalogs_dirty()
+bool AllAssetLibrary::is_catalogs_dirty() const
 {
   return catalogs_dirty_;
 }

source/blender/asset_system/intern/asset_library_all.hh

@@ -30,7 +30,7 @@ class AllAssetLibrary : public AssetLibrary {
   void rebuild_catalogs_from_nested(bool reload_nested_catalogs);
 
   void tag_catalogs_dirty();
-  bool is_catalogs_dirty();
+  bool is_catalogs_dirty() const;
 };
 
 }  // namespace blender::asset_system