### Godot version

v4.0.beta.custom_build [fab9926a9]

### System information

Fedora 37

### Issue description

When creating a new inherited scene, saving the scene (for example with Ctrl+S) defaults to overwriting the scene being inherited, instead of prompting for a location to save to.

### Steps to reproduce

1. Create a new inherited scene
2. Press Ctrl+S

If the scene being inherited is imported (for example from a glTF), an error displays. If the inherited scene is a .tscn or .scn, it gets overridden by an inherited scene that tries to inherit itself, which is impossible and thus corrupt.

### Minimal reproduction project

N/A
for (FileDialog *E : file_dialogs) {
		E->invalidate();
	}
	for (EditorFileDialog *E : editor_file_dialogs) {
		E->invalidate();
	}
	_mark_unsaved_scenes();
	
	String export_error;
	Error err = OK;
	if (!export_defer.preset.is_empty() && !EditorFileSystem::get_singleton()->is_scanning()) {
		String preset_name = export_defer.preset;
		
		
		export_defer.preset = "";
		Ref<EditorExportPreset> export_preset;
		for (int i = 0; i < EditorExport::get_singleton()->get_export_preset_count(); ++i) {
			export_preset = EditorExport::get_singleton()->get_export_preset(i);
			if (export_preset->get_name() == preset_name) {
				break;
			}
			export_preset.unref();