Warn unknown devices: treat MXDeviceUnknown as MXDeviceUnverified

Vector/Views/Device/DeviceTableViewCell.m

@@ -1,6 +1,7 @@
 /*
  Copyright 2016 OpenMarket Ltd
- 
+ Copyright 2017 Vector Creations Ltd
+
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
@@ -49,6 +50,7 @@
     
     switch (deviceInfo.verified)
     {
+        case MXDeviceUnknown:
         case MXDeviceUnverified:
         {
             self.deviceStatus.image = [UIImage imageNamed:@"e2e_warning"];