Remove assigns for atypefile

Remove assigns for   atypefile

This is old code - I  traced back it's introduction to  https://github.com/civicrm/civicrm-svn/commit/fb3038000356998e43b0c9aea67f0186f7e41516
which relates to https://issues.civicrm.org/jira/browse/CRM-3829?page=com.atlassian.streams.streams-jira-plugin:activity-stream-issue-tab

At that time the template used the variable- ie https://github.com/civicrm/civicrm-svn/commit/fb3038000356998e43b0c9aea67f0186f7e41516#diff-6fc7e9552ffce6cf4cb7680854ef7b70R4

But that is no longer the case