fix: bot hangs occasionally

Do not wait for button clicked as it hangs the bot. It may be a bug of
selenium or Shopee frontend website is not responsing well.

src/tw-shopee-bot.ts

@@ -68,7 +68,7 @@ export default class TaiwanShopeeBot {
     const btnLogin = await this.driver.findElement(By.xpath(xpathByText('button', '登入')))
     // Wait until the login button is enabled.
     await this.driver.wait(until.elementIsEnabled(btnLogin), waitTimeout)
-    await btnLogin.click()
+    btnLogin.click() // do not wait for click since it may hang = =
     logger.debug('Login form submitted.')
 
     // Wait for something happens.