Backport the equalto test to ensure it works on old jinja2 version
    
    The equalto test was added in jinja2 version 2.8:
    http://jinja.pocoo.org/docs/2.9/templates/#equalto
    So to get it working on older version, we need this line added.
    
    This fixes accessing an user's PR page such as:
    https://pagure.io/user/pingou/requests