### 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)

return caret_mid_grapheme_enabled;
}
bool LineEdit::is_caret_blink_enabled() const {
	return caret_blink_enabled;
}
void LineEdit::set_caret_blink_enabled(const bool p_enabled) {
	if (caret_blink_enabled == p_enabled) {
		return;
	}
	caret_blink_enabled = p_enabled;
	set_process_internal(p_enabled);
	draw_caret = !caret_blink_enabled;
	if (caret_blink_enabled) {
		caret_blink_timer = 0.0;
	}
	queue_redraw();
	notify_property_list_changed();
}
bool LineEdit::is_caret_force_displayed() const {
	return caret_force_displayed;
}
void LineEdit::set_caret_force_displayed(const bool p_enabled) {
	if (caret_force_displayed == p_enabled) {
		return;
	}
	caret_force_displayed = p_enabled;
	_validate_caret_can_draw();
	queue_redraw();
}
float LineEdit::get_caret_blink_interval() const {