Android: Remove Cosmetic sleep() on Login

Having done some research around the root causes of the issue seen in #220 and what might make getActivity() return null, this block of code has become suspect.

This delay after login has a purely cosmetic intent but might be causing timing effects that violate the activity lifecycle by hard blocking the UI thread.  Going ahead and removing it since it, at best, has a smell to it and may very well be the root cause of the crashes.