### 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)

middle_mouse_paste_enabled = p_enabled;
}
bool LineEdit::is_middle_mouse_paste_enabled() const {
	return middle_mouse_paste_enabled;
}
void LineEdit::set_selecting_enabled(bool p_enabled) {
	if (selecting_enabled == p_enabled) {
		return;
	}
	selecting_enabled = p_enabled;
	if (!selecting_enabled) {
		deselect();
	}
}
bool LineEdit::is_selecting_enabled() const {
	return selecting_enabled;
}
void LineEdit::set_deselect_on_focus_loss_enabled(const bool p_enabled) {
	if (deselect_on_focus_loss_enabled == p_enabled) {
		return;
	}
	deselect_on_focus_loss_enabled = p_enabled;
	if (p_enabled && selection.enabled && !has_focus()) {
		deselect();
	}
}
bool LineEdit::is_deselect_on_focus_loss_enabled() const {
	return deselect_on_focus_loss_enabled;
}
void LineEdit::set_right_icon(const Ref<Texture2D> &p_icon) {