don't create a new frame for about:error pages on pinned tabs

fix #4036
auditors @bbondy

Test Plan:
1. Add a pinned tab for brave.com
2. Disconnect from the network
3. Open a new window
Pinned tab should show network error page

1. Add a pinned tab for brave.com
2. Go to the pinned tab and navigate to cnn.com
3. cnn.com should open in new tab

js/actions/windowActions.js

@@ -51,7 +51,9 @@ const windowActions = {
  location = location.trim()
  let newFrame = false
  if (frame.get('pinnedLocation') && location !== 'about:certerror' &&
- frame.get('location') !== 'about:certerror') {
+ frame.get('location') !== 'about:certerror' &&
+ location !== 'about:error' &&
+ frame.get('location') !== 'about:error') {
  try {
  const origin1 = new window.URL(frame.get('location')).origin
  const origin2 = new window.URL(location).origin