Fix an error "uninitialized constant Redmine::ProjectJumpBox" in the production environment (#31355).

git-svn-id: http://svn.redmine.org/redmine/trunk@18183 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine.rb

@@ -43,6 +43,7 @@ require 'redmine/field_format'
 require 'redmine/menu_manager'
 require 'redmine/notifiable'
 require 'redmine/platform'
+require 'redmine/project_jump_box'
 require 'redmine/mime_type'
 require 'redmine/search'
 require 'redmine/syntax_highlighting'