message: Fix desktop captcha check
  Change gnarly hardcoded protocol to detect running in the electron app
  Fixes
diff: @@ -62,7 +62,7 @@ module.exports = React.createClass({
  console.log("Loading recaptcha script...");
  window.mx_on_recaptcha_loaded = () => {this._onCaptchaLoaded();};
  const protocol = global.location.protocol;
  - if (protocol === "file:") {
  + if (protocol === "vector:") {
  const warning = document.createElement('div');
  // XXX: fix hardcoded app URL. Better solutions include:
  // * jumping straight to a hosted captcha page (but we don't support that yet)
  