Enable the 'purge' command on the Junk folder.

Applying this patch results in a interface change to the user (though it's a very very small change) so I would like feedback on this first.

Robin

Index: program/js/app.js

--- program/js/app.js (revision 371) +++ program/js/app.js (working copy) @@ -3118,7 +3118,7 @@

   case 'list':
     if (this.env.messagecount)

•      this.enable_command('purge', (this.env.mailbox==this.env.trash_mailbox));
  

•      this.enable_command('purge', (this.env.mailbox==this.env.trash_mailbox || this.env.mailbox==this.env.junk_mailbox));
  
   case 'expunge':
     this.enable_command('select-all', 'select-none', 'expunge', this.env.messagecount ? true : false);