CRM-13973 - set cancelled class in line item listings for line items that have been de-selected - e.g. QTY = 0.

----------------------------------------
* CRM-13973:
  https://issues.civicrm.org/jira/browse/CRM-13973
Merge pull request #3631 from davecivicrm/CRM-13973a

CRM-13973 - set cancelled class in line item listings for line items tha...