Update the selected preset when dialog is shown

The selected preset in the dialog is not updated when preset is changed
from remote devices. Notify the adapter when the value is updated in
preset preference.

Flag: EXEMPT bugfix
Bug: 402672688
Test: atest BluetoothDetailsHearingAidsPresetsControllerTest
Test: atest PresetListPreferenceTest
Change-Id: Ib9df57985ef4764607f30f11b54a2bfb4a1ebb8c