[bugfix] Fix reimporting scene withh default values selected

This commit fixes #78140

When the scene was re-imported with non-default values of some settings, re-importing it again using default values for those settings didn't have the effect.

The problem was that when handling the reimport, a wrong dictionary of the settings was used.

(cherry picked from commit 8b729e5b7e)

editor/import/scene_import_settings.cpp

@@ -927,7 +927,7 @@ void SceneImportSettings::_viewport_input(const Ref<InputEvent> &p_input) {
 void SceneImportSettings::_re_import() {
 	HashMap<StringName, Variant> main_settings;
 
-	main_settings = defaults;
+	main_settings = scene_import_settings_data->current;
 	main_settings.erase("_subresources");
 	Dictionary nodes;
 	Dictionary materials;