Make the stats page use the new stats API endpoint
    
    We originally designed this code to use the existing API endpoint
    with an argument to say that it wants the detailed version of the
    stats. We later changed our mind and move the details to a new
    API endpoint, but apparently we forgot to update the UI to point
    to the new API endpoint (while all the JS code is compatible/expected
    this data).
    
    Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>