Fix idempotence of role

CRITICAL Idempotence test failed because of the following tasks:
*  => ansible-role-hedgedocs : Download archive from github
*  => ansible-role-hedgedocs : Extract archive to home diretory
*  => ansible-role-hedgedocs : Delete downloaded archive
*  => ansible-role-hedgedocs : Make script and dependencies executable by all users
*  => ansible-role-hedgedocs : Configure dependencies
*  => ansible-role-hedgedocs : Remove script and dependencies execute right for all users
*  => ansible-role-hedgedocs : Push Hedgedocs service configuration file
*  => ansible-role-hedgedocs : Set safe permission recursively for Hedgedocs folder
*  => ansible-role-hedgedocs : Reload nginx