message: style: simplify finding the first script in document
diff: // come out in the wrong order. Because of that we don't need async=1 as GA does.
  // it was probably(?) a legacy behavior that they left to not modify few years old snippet
  // https://www.html5rocks.com/en/tutorials/speed/script-loading/
  - var _currentScriptTag = _document.getElementsByTagName(_script)[0];
  + var _currentScriptTag = _document.scripts[0];
  var _newScriptTag = _document.createElement(_script);
  _newScriptTag.src = _sdkBundleUrl;
  _newScriptTag.setAttribute('crossorigin', 'anonymous');
  