Update dream settings when packages are added or removed.

This fixes a bug with the dreams grid not refreshing correctly
when a package containing a dream is added or removed under certain
conditions.

NO_IFTTT=no changes necessary

Fixes: 415125775
Test: atest DreamSettingsTest, DreamPickerControllerTest
Flag: EXEMPT bugfix

Change-Id: Ib62c996f2b00d31c00038c0fb6a9565f86216f0d