Update source metric category of HearingAidDialogFragment and HearingAidPairingDialogFragment

Use different source metric categories to distinguish different launch sources of the BluetoothPairingDetail page.

Bug: 237344016
Test: manual
Change-Id: If762e87414055f3e497f99ea6885f7736b7193cd

src/com/android/settings/accessibility/HearingAidDialogFragment.java

@@ -51,7 +51,7 @@ public class HearingAidDialogFragment extends InstrumentedDialogFragment {
     private void launchBluetoothAddDeviceSetting() {
         new SubSettingLauncher(getActivity())
                 .setDestination(BluetoothPairingDetail.class.getName())
-                .setSourceMetricsCategory(SettingsEnums.ACCESSIBILITY)
+                .setSourceMetricsCategory(getMetricsCategory())
                 .launch();
     }
 }