epacket: packet: use requested auth

Use the requested authorisation level for the final hop, instead of
hardcoding `Auth.DEVICE`.

Signed-off-by: Jordan Yates <jordan@embeint.com>

Author: JordanYates

src/infuse_iot/epacket/packet.py

@@ -233,7 +233,7 @@ def to_serial(self, database: DeviceDatabase) -> bytes:
             assert bt_addr is not None
 
             # Forwarded payload
-            forward_payload = CtypeBtGattFrame.encrypt(database, final.infuse_id, self.ptype, Auth.DEVICE, self.payload)
+            forward_payload = CtypeBtGattFrame.encrypt(database, final.infuse_id, self.ptype, final.auth, self.payload)
 
             # Forwarding header
             forward_hdr = CtypeForwardHeaderBtGatt(