Suggest verifying your own device in Devices settings

This button is currently hidden under the user menu, but it should be
shown more prominently - especially under the Devices settings. The
button under the user menu and this new one is now hidden when your
device is already verified.

src/libneochat/neochatconnection.cpp

@@ -558,4 +558,9 @@ bool NeoChatConnection::enablePushNotifications() const
     return m_pushNotificationsEnabled;
 }
 
+bool NeoChatConnection::isVerifiedSession() const
+{
+    return isVerifiedDevice(userId(), deviceId());
+}
+
 #include "moc_neochatconnection.cpp"