"Layers" tab doesn't follow the layer tree

[Gustry]

Description

The layer is still in Lizmap while it has been removed from the legend. The CFG will be written with everything about this layer which is becoming a "group" at the same time.

       "points": {
            "id": "points_70389da6_da2c_42e2_bddc_b46963fb9afa",
            "name": "points",
            "type": "group",     <------- this is strange too. A layer became a group
            "title": "points",
            "abstract": "",
            "link": "",
            "minScale": 1,
            "maxScale": 1000000000000,
            .....

I hope LWC can manage well when a ghost group is in the CFG file.

Context

• QGIS version: 3.4
• Lizmap version: 3.2.1 DEV
• OS: Ubuntu 19.10

[Gustry]

I can't replicate anymore my own issue.