Refactor: Replace @journal with @issue.current_journal

This removes an instance variable in #issue_update which will let it be moved
to the Issue model.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3540 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/issue.rb

@@ -47,6 +47,8 @@ class Issue < ActiveRecord::Base
                             :author_key => :author_id
 
   DONE_RATIO_OPTIONS = %w(issue_field issue_status)
+
+  attr_reader :current_journal
   
   validates_presence_of :subject, :priority, :project, :tracker, :author, :status
   validates_length_of :subject, :maximum => 255