Make project custom fields available as columns on time logs (#24157).

Patch by Jan Schulz-Hofen.

git-svn-id: http://svn.redmine.org/redmine/trunk@16418 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/time_entry_query.rb

@@ -91,6 +91,8 @@ class TimeEntryQuery < Query
                             map {|cf| QueryCustomFieldColumn.new(cf) }
     @available_columns += issue_custom_fields.visible.
                             map {|cf| QueryAssociationCustomFieldColumn.new(:issue, cf, :totalable => false) }
+    @available_columns += ProjectCustomField.visible.
+                            map {|cf| QueryAssociationCustomFieldColumn.new(:project, cf) }
     @available_columns
   end