### 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 st_parser;
}
void LineEdit::set_structured_text_bidi_override_options(Array p_args) {
	st_args = p_args;
	_shape();
	queue_redraw();
}
Array LineEdit::get_structured_text_bidi_override_options() const {
	return st_args;
}
void LineEdit::clear() {
	clear_internal();
	_text_changed();
	
	if (has_focus()) {
		show_virtual_keyboard();
	}
}
void LineEdit::show_virtual_keyboard() {
	if (DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_VIRTUAL_KEYBOARD) && virtual_keyboard_enabled) {
		if (selection.enabled) {
			DisplayServer::get_singleton()->virtual_keyboard_show(text, get_global_rect(), DisplayServer::VirtualKeyboardType(virtual_keyboard_type), max_length, selection.begin, selection.end);
		} else {
			DisplayServer::get_singleton()->virtual_keyboard_show(text, get_global_rect(), DisplayServer::VirtualKeyboardType(virtual_keyboard_type), max_length, caret_column);
		}
	}
}
String LineEdit::get_text() const {