Unset folder selection after folder is deleted.

svncommit

2007-10-15 fdbb1916ef7298b2641ac2ed665e660f6a9fa066

Unset folder selection after folder is deleted.

 program/js/app.js

@@ -2635,6 +2635,8 @@
    
    if (folder)
      this.http_post('delete-folder', '_mboxes='+urlencode(folder));

    this.set_env('folder', null);
    };