XMLHttpRequest api has a wrong `-was-aborted` implementation

[joana-sanchez-otm]

XHR's readyState when aborted is 4 (DONE), not 0 (UNSENT), and it returns an http status of 0 when it is aborted, so this does not work:

cljs-ajax/src/ajax/xml_http_request.cljs

Line 70 in a646036

(-was-aborted [this] (= 0 (.-readyState this))))

In our code we are checking if the http status is 0 instead of checking for :failure :abort or using -was-aborted because of this.

Even if -was-aborted was fixed in the protocol implementation, I think it won't return :failure :aborted ,because it returns :failure :failed when the HTTP status is 0:

https://github.com/JulianBirch/cljs-ajax/blob/d551a46dbdeea7a5c9722fa008c78adda8ebcb1d/src/ajax/interceptors.cljc#L110:L113