Fixing widgets get deteled because of double bind

If the AppWidgetHost starts listening in the middle of bind, it rebinds
the old widgets before a new widget is bound, leading to double bind.
We should clear all pending binds, before starting a rebind. As an
extra check only rebind a view which is attached to the screen.

Bug: 73814840
Change-Id: Ie3af683dc4095b158547e700d11e4faf7999466f