Not to update IME when Settings version is older than the last updated version.

- Check if just old version or not.

- Sometimes, ContentObserver.onChange is called before finishing to save the actual value.
This can be verified by checking the system settings version. If the version is not updated,
cached value will be returned from Settings.Secure, and this should not be handled.

Bug: 3406300

Change-Id: Ie3f5b484b5574e10a41dfc209ed31271a474b828