Do not close cursor in onLoadFinished

Apparently in cursor loaders you don't need to manually close
the cursor because it does it for you at the end. doing so can
also cause crashes on device configuration changes since it
will call the method again with the same cursor.

Test: robotests still pass
Bug: 38208727
Change-Id: I285e56546daf726e74b903856b17dc034d6fd538