### Godot version

4.0.2.stable.official [7a0977ce2]

### System information

Windows 10

### Issue description

LineEdit node with enabled "expand_to_text_length" option and "minimum_character_width = 0" and cleared margins in style overrides still has some empty space inside
![node](https://github.com/godotengine/godot/assets/23380802/86c79678-8422-4a98-8406-602edd7dc48b)
![node settings](https://github.com/godotengine/godot/assets/23380802/11d04d71-bbf1-4c16-8155-fe39b5bbd66b)
![style overrides](https://github.com/godotengine/godot/assets/23380802/6b3c3925-b4bd-455b-aac1-ddeb54a4d796)


### Steps to reproduce

1. Add LineEdit node
2. Set expand_to_text_length = true
3. Set minimum_character_width in theme overrides = 0
4. Set normal to StyleBoxEmpty


### Minimal reproduction project

[LineEdit can't be zero sized.zip](https://github.com/godotengine/godot/files/11566017/LineEdit.can.t.be.zero.sized.zip)

if (clear_button_enabled == p_enabled) {
		return;
	}
	clear_button_enabled = p_enabled;
	_fit_to_width();
	update_minimum_size();
	queue_redraw();
}
bool LineEdit::is_clear_button_enabled() const {
	return clear_button_enabled;
}
void LineEdit::set_shortcut_keys_enabled(bool p_enabled) {
	shortcut_keys_enabled = p_enabled;
}
bool LineEdit::is_shortcut_keys_enabled() const {
	return shortcut_keys_enabled;
}
void LineEdit::set_virtual_keyboard_enabled(bool p_enable) {
	virtual_keyboard_enabled = p_enable;
}
bool LineEdit::is_virtual_keyboard_enabled() const {
	return virtual_keyboard_enabled;
}
void LineEdit::set_virtual_keyboard_type(VirtualKeyboardType p_type) {
	virtual_keyboard_type = p_type;
}
LineEdit::VirtualKeyboardType LineEdit::get_virtual_keyboard_type() const {
	return virtual_keyboard_type;
}
void LineEdit::set_middle_mouse_paste_enabled(bool p_enabled) {