SVGHMI: changes that should fix some corner cases about unlinking and discardable element that still didn't show until now.
- list that would have been declared in some groups could have been discarded.
- elements to be unlinked were comuted based on filtering $hmi_elements, whereas $hmi_widget already filtered list

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{

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    "ID": "wamptest", 

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    "active": true, 

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    "protocolOptions": {

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        "autoPingInterval": 60, 

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        "autoPingTimeout": 20

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    }, 

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    "realm": "Automation", 

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    "url": "ws://127.0.0.1:8888"

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}