Fixed Version#issues_progress for Rails 3.1.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@8986 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/version.rb

@@ -233,8 +233,8 @@ class Version < ActiveRecord::Base
         ratio = open ? 'done_ratio' : 100
 
         done = fixed_issues.sum("COALESCE(estimated_hours, #{estimated_average}) * #{ratio}",
-                                  :include => :status,
-                                  :conditions => ["is_closed = ?", !open]).to_f
+                                  :joins => :status,
+                                  :conditions => ["#{IssueStatus.table_name}.is_closed = ?", !open]).to_f
         progress = done / (estimated_average * issues_count)
       end
       progress