App no longer works in iOS private mode.

[3vivekb]

Currently modeify doesn't appear when loaded in:

1. Private mode in Safari on macOS
2. Private mode in Safari on iOS
3. Incognito mode in Chrome on iOS

This problem may only be present on phones with iOS 10+,
It occurs because of calls to session storage and local storage, which cause it to error out. See more details here.

[3vivekb]

We decided to that instead of rebuilding we would just pop a warning. Here is the code:
vta@048667d