### 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)

case NOTIFICATION_RESIZED: {
			_fit_to_width();
			scroll_offset = 0.0;
			set_caret_column(get_caret_column());
		} break;
		case NOTIFICATION_LAYOUT_DIRECTION_CHANGED:
		case NOTIFICATION_THEME_CHANGED: {
			_shape();
			queue_redraw();
		} break;
		case NOTIFICATION_TRANSLATION_CHANGED: {
			placeholder_translated = atr(placeholder);
			_shape();
			queue_redraw();
		} break;
		case NOTIFICATION_WM_WINDOW_FOCUS_IN: {
			window_has_focus = true;
			_validate_caret_can_draw();
			queue_redraw();
		} break;
		case NOTIFICATION_WM_WINDOW_FOCUS_OUT: {
			window_has_focus = false;
			_validate_caret_can_draw();
			queue_redraw();
		} break;
		case NOTIFICATION_INTERNAL_PROCESS: {
			if (caret_blink_enabled && caret_can_draw) {
				caret_blink_timer += get_process_delta_time();
				if (caret_blink_timer >= caret_blink_interval) {
					caret_blink_timer = 0.0;