### Godot version

4.0 Beta 17

### System information

Windows 10

### Issue description

The dialog to save your editor layout can be unclear, for example, if you only have one saved layout, and you change it, you see this:

![image](https://user-images.githubusercontent.com/24925519/216171286-c9842401-dade-4a52-aa7f-724b60f313de.png)

I automatically assumed that just going right to clicking "Save" would overwrite my current layout as it's shown right in the box there, but doing this leads to nothing happening (dialog stays open). This is a very minor issue, as it only took a minute to realize that I had to actually click on "Normal" to select and overwrite the layout, but I believe a minor change to this menu would improve clarity.

I propose a couple of solutions to this:
1. The currently loaded layout should be selected by default.
2. There should be a third button, "Overwrite Current" that saves as the current layout.

### Steps to reproduce

Simply load any project, or use a blank one, and open the save editor layout dialogue to reproduce this.

### Minimal reproduction project

N/A
#ifndef EDITOR_LAYOUTS_DIALOG_H
#define EDITOR_LAYOUTS_DIALOG_H
#include "scene/gui/dialogs.h"
class LineEdit;
class ItemList;
class EditorLayoutsDialog : public ConfirmationDialog {
	GDCLASS(EditorLayoutsDialog, ConfirmationDialog);
	LineEdit *name = nullptr;
	ItemList *layout_names = nullptr;
	VBoxContainer *makevb = nullptr;
	void _line_gui_input(const Ref<InputEvent> &p_event);
protected:
	static void _bind_methods();
	virtual void ok_pressed() override;
	virtual void _post_popup() override;
public:
	EditorLayoutsDialog();
	void set_name_line_enabled(bool p_enabled);
};
#endif