CRM-12308 Removed reference to a non-existent template. Checked that $in...

...itialPayment which triggers the include is not declared anywhere in the codebase. This was cruft left-over from partial payment functionality which is partially implemented under CiviAcocounts branch and then removed.

----------------------------------------
* CRM-12308: Missing template file
  http://issues.civicrm.org/jira/browse/CRM-12308