### 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 (int i = 0; i < editor_data.get_edited_scene_count(); i++) {
		Node *node = editor_data.get_edited_scene_root(i);
		if (!node) {
			continue;
		}
		String path = node->get_scene_file_path();
		if (!path.is_empty() && !FileAccess::exists(path)) {
			
			EditorUndoRedoManager::get_singleton()->set_history_as_unsaved(editor_data.get_scene_history_id(i));
		}
	}
	_update_title();
	_update_scene_tabs();
}
void EditorNode::_dialog_action(String p_file) {