Fix stored message retrieval.

// FREEBIE

src/main/java/org/whispersystems/textsecuregcm/storage/StoredMessages.java

@@ -68,7 +68,7 @@ public class StoredMessages {
       jedis = jedisPool.getResource();
       String message;
 
-      while ((message = jedis.rpop(QUEUE_PREFIX + accountId + ":" + deviceId)) != null) {
+      while ((message = jedis.rpop(getKey(accountId, deviceId))) != null) {
         messages.add(message);
       }