Unrestrict SMS/PHONE app if it been set active

If an app been set default SMS/PHONE app, we need to unrestrict this
app. This CL extract a common function and invoke it when necessary.

Change-Id: Id29c5138438aa6f6f22cdd9c4ecf336de8481782
Fixes: 80305978
Test: robotests

src/com/android/settings/applications/defaultapps/DefaultPhonePicker.java

@@ -80,6 +80,7 @@ public class DefaultPhonePicker extends DefaultAppPickerFragment {
     @Override
     protected boolean setDefaultKey(String key) {
         if (!TextUtils.isEmpty(key) && !TextUtils.equals(key, getDefaultKey())) {
+            mBatteryUtils.clearForceAppStandby(key);
             return mDefaultKeyUpdater.setDefaultDialerApplication(getContext(), key, mUserId);
         }
         return false;