Fixes ReferenceError: document is not defined

[catamphetamine]

Fixes #272

ReferenceError: document is not defined

ariaAppHider.js:5 Object.setElement
[frontend]/[react-responsive-ui]/node_modules/react-modal/lib/helpers/ariaAppHider.js

[catamphetamine]

Actually the change should be this instead:

function setElement(element) {
  if (typeof element === 'string') {
    if (typeof document === 'undefined') {
      return _element;
    }
    var el = document.querySelectorAll(element);
    element = 'length' in el ? el[0] : el;
  }
  _element = element || _element;
  return _element;
}

[catamphetamine]

Seems that I've been calling setElement by myself to fix "call setBodyElement" bug.