Send "unidentified sender" messages as plain text.

libsignal/src/main/java/org/session/libsignal/service/loki/crypto/LokiServiceCipher.kt

@@ -23,14 +23,21 @@ class LokiServiceCipher(
 
     override fun decrypt(envelope: SignalServiceEnvelope, ciphertext: ByteArray): Plaintext {
 //        return if (envelope.isFallbackMessage) decryptFallbackMessage(envelope, ciphertext) else super.decrypt(envelope, ciphertext)
-//        return decryptFallbackMessage(envelope, ciphertext);
 
+        return when {
+            envelope.isUnidentifiedSender -> {
                 //AC: Messages come unencrypted (for refactoring time being).
                 val transportDetails = PushTransportDetails(FallbackSessionCipher.sessionVersion)
                 val unpaddedMessageBody = transportDetails.getStrippedPaddingMessageBody(ciphertext)
                 val metadata = Metadata(envelope.source, envelope.sourceDevice, envelope.timestamp, false)
                 return Plaintext(metadata, unpaddedMessageBody)
             }
+            envelope.isFallbackMessage ->
+                decryptFallbackMessage(envelope, ciphertext)
+            else ->
+                super.decrypt(envelope, ciphertext)
+        }
+    }
 
     private fun decryptFallbackMessage(envelope: SignalServiceEnvelope, ciphertext: ByteArray): Plaintext {
         val cipher = FallbackSessionCipher(userPrivateKey, envelope.source)