async unpinChat(chatId) {
        return this.pupPage.evaluate(async chatId => {
            let chat = await window.WWebJS.getChat(chatId, { getAsModel: false });
            if (!chat.pin) {
                return false;
            }
            await window.Store.Cmd.pinChat(chat, false);
            return false;
        }, chatId);
    }
Unpins the Chat
@returns {Promise<boolean>} New pin state