Change RTCPeerConnectionIceErrorEventInit.statusText to errorText

Fixes #2603
Also points out that a test exists - in the process of being merged
upstream, see Chromium PR for status:

https://chromium-review.googlesource.com/c/chromium/src/+/2555011

webrtc.html

@@ -6775,7 +6775,7 @@ <h2>
  </h2>
  <dl data-link-for="RTCPeerConnectionIceErrorEvent" data-dfn-for=
  "RTCPeerConnectionIceErrorEvent" class="constructors">
- <dt>
+ <dt data-tests="RTCPeerConnectionIceErrorEvent.html">
  <dfn>RTCPeerConnectionIceErrorEvent.constructor()</dfn>
  </dt>
  <dd></dd>
@@ -6879,7 +6879,7 @@ <h2>
  unsigned short? port;
  DOMString url;
  required unsigned short errorCode;
- USVString statusText;
+ USVString errorText;
 };</pre>
  <section>
  <h2>
@@ -6930,7 +6930,7 @@ <h2>
  </p>
  </dd>
  <dt data-tests="">
- <dfn data-idl="">statusText</dfn> of type <span class=
+ <dfn data-idl="">errorText</dfn> of type <span class=
  "idlMemberType">USVString</span>
  </dt>
  <dd>