Add missing vars in session less message

[mregen]

fixes #1188

[codecov]

Codecov Report

Merging #1505 (2b2f3ad) into master (76afe82) will increase coverage by 0.01%.
The diff coverage is 27.27%.

@@            Coverage Diff             @@
##           master    #1505      +/-   ##
==========================================
+ Coverage   51.93%   51.94%   +0.01%     
==========================================
  Files         307      307              
  Lines       58332    58342      +10     
==========================================
+ Hits        30292    30306      +14     
+ Misses      28040    28036       -4     

Impacted Files	Coverage Δ
...Ua.Core/Types/BuiltIn/SessionLessServiceMessage.cs	33.33% <27.27%> (-0.88%)	⬇️
...braries/Opc.Ua.Server/Subscription/Subscription.cs	54.48% <0.00%> (+0.11%)	⬆️
...raries/Opc.Ua.Server/Subscription/MonitoredItem.cs	43.78% <0.00%> (+0.30%)	⬆️
Libraries/Opc.Ua.Client/Session.cs	61.04% <0.00%> (+0.36%)	⬆️
...tack/Opc.Ua.Core/Stack/Tcp/TcpTransportListener.cs	72.54% <0.00%> (+0.39%)	⬆️

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[mrsuciu]

Looks good