Fix permission issue with START_WIDGET_PICKER_ACTIVITY

The permission for starting the widget picker activity didn't match its
declaration, making it orphaned. Any other package/app could then spoof
the permission and start the activity.

Bug: 365082993
Test: Manually by creating an app that attempts to spoof the permission
and testing that it was not able to show the activity.
Flag: EXEMPT bugfix

Change-Id: I1af4bc68329a30eb8d6a92c944f6c84b4992107a
1 file changed