update the conversations view (and the lock icon) after receiving device list

src/main/java/eu/siacs/conversations/crypto/axolotl/AxolotlService.java

@@ -415,6 +415,7 @@ public class AxolotlService implements OnAdvancedStreamFeaturesLoaded {
 			}
 		}
 		this.deviceIds.put(jid, deviceIds);
+		mXmppConnectionService.updateConversationUi(); //update the lock icon
 		mXmppConnectionService.keyStatusUpdated(null);
 	}