### 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 scroll_offset;
}
void LineEdit::insert_text_at_caret(String p_text) {
	if (max_length > 0) {
		
		int available_chars = max_length - text.length();
		if (p_text.length() > available_chars) {
			emit_signal(SNAME("text_change_rejected"), p_text.substr(available_chars));
			p_text = p_text.substr(0, available_chars);
		}
	}
	String pre = text.substr(0, caret_column);
	String post = text.substr(caret_column, text.length() - caret_column);
	text = pre + p_text + post;
	_shape();
	TextServer::Direction dir = TS->shaped_text_get_dominant_direction_in_range(text_rid, caret_column, caret_column + p_text.length());
	if (dir != TextServer::DIRECTION_AUTO) {
		input_direction = (TextDirection)dir;
	}
	set_caret_column(caret_column + p_text.length());
	if (!ime_text.is_empty()) {
		_shape();
	}
}
void LineEdit::clear_internal() {