Remove sandboxing from hidden iframe, due to change in eSTS redirect #1053
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STS now performs its redirects client-side in JavaScript, meaning we can no longer sandbox hidden iframes, as it will prevent the redirect from happening at all. Added code to immediately remove the iframe once we have the hash from the url, to mitigate MSAL code rerunning in the iframe (this is similar to what we do for popups, which we also can't sandbox).
Also removed ES6 JS that wasn't working in IE11 and replaced with ES5 code.