Save photo picker callback state on activity destroy

When the activity is destroyed, we should remember that we were showing
the photo picker. Otherwise, the dialog won't close when the photo
picker is closed.

Test: manual
Relnote: fix UI issue with permission grant dialog
Fixes: 308830728
Change-Id: Ibbf5466747e999f19e790c3b981976ff6369bb9a
Merged-In: Ibbf5466747e999f19e790c3b981976ff6369bb9a