FIX: signed_in_promise() login check bug

[JoiNNN]

We now also compare the _profilepath to make sure currently logged in user data matches.

_This is a quick fix, a proper one would be done by making use of ES's storage, however, chrome.storage.local unlike localStorage is not synchronous, and so all functions depending on signed_in_promise() would need to wrapped and deffered until signed_inpromise() completes. And since this will need some extended testing we'll postpone until we decide to move functions in sepparate files.

[jshackles]

This is a good sanity check that we can use in the meantime, thanks! 👍