Revert "Error concatenating lists and bytearray fixed."

This reverts commit e74f489.

Reverting this commit makes things work for @tonke.

References:
- #1

dragino/LoRaWAN/DataPayload.py

@@ -59,7 +59,7 @@ def decrypt_payload(self, key, direction, mic):
         cipher = AES.new(bytes(key))
         s = cipher.encrypt(bytes(a))
 
-        padded_payload = bytearray()
+        padded_payload = []
         padding=[0x00] * 16
         for i in range(k):
             idx = (i + 1) * 16
@@ -88,8 +88,8 @@ def encrypt_payload(self, key, direction, data):
         cipher = AES.new(bytes(key))
         s = cipher.encrypt(bytes(a))
 
-        padded_payload = bytearray()
-        padding=bytearray([0x00]*16)
+        padded_payload = []
+        padding=[0x00]*16
         for i in range(k):
             idx = (i + 1) * 16
             padded_payload += (data[idx - 16:idx] + padding)[:16]