Order is not preserved when securely storing an ordered set

When attempting to store an ordered set such as a `LinkedHashSet` the ordering is lost. This is due to [using a HashSet](https://github.com/adorsys/secure-storage-android/blob/a6345b64f1ff2f27037f613e57050f0f20604762/securestoragelibrary/src/main/java/de/adorsys/android/securestoragelibrary/SecurePreferences.java#L236) when retrieving set values.