Update the cache of a2dp config before writing config.

The created config based on mBluetoothA2dpConfigStore is invalid, so we need to update the cache before writing config.

Bug: 3177357791
Test: manual
Change-Id: I47774f035509f0cb533209e4e31e7477d5b8e516

src/com/android/settings/development/bluetooth/AbstractBluetoothDialogPreferenceController.java

@@ -86,6 +86,8 @@ public abstract class AbstractBluetoothDialogPreferenceController extends
         if (bluetoothA2dp == null) {
             return;
         }
+        // update the cache of a2dp config(mBluetoothA2dpConfigStore) before writing config.
+        initConfigStore();
         writeConfigurationValues(index);
         final BluetoothCodecConfig codecConfig = mBluetoothA2dpConfigStore.createCodecConfig();
         BluetoothDevice activeDevice = getA2dpActiveDevice();