title: Magento 2.1 email logo image function not working, broken image after upload
body: <p>Steps :
  1. Go To Magento Admin.
  2. Upload Email logo in path Content -> Configuration -> Transactional Email -> Logo Image
  3. Save</p>
  
  <p>Expected result - 
  New Email Logo should show in New Order (ALL) Emails</p>
  
  <p>Actual result -
  Logo Image URL Broken in preview under path Content -> Configuration -> Transactional Email -> Logo Image.</p>