### 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 (!editable) {
		return;
	}
	if (p_all_to_left) {
		deselect();
		text = text.substr(0, caret_column);
		_text_changed();
		return;
	}
	if (selection.enabled) {
		selection_delete();
		return;
	}
	if (p_word) {
		int cc = caret_column;
		PackedInt32Array words = TS->shaped_text_get_word_breaks(text_rid);
		for (int i = words.size() - 2; i >= 0; i = i - 2) {
			if (words[i] < cc) {
				cc = words[i];
				break;
			}
		}
		delete_text(cc, caret_column);
		set_caret_column(cc);
	} else {
		delete_char();
	}
}
void LineEdit::_delete(bool p_word, bool p_all_to_right) {