Additional border is displayed for object types

[sebdeleze]

Describe the issue
Following this property example:

"editionStatement": {
    "title": "Edition",
    "type": "object",
    "additionalProperties": false,
    "properties": {
        "editionDesignation": {
            "title": "Designation",
            "type": "object",
            "properties": {
                "value": {
                    "title": "Value",
                    "type": "string",
                    "minLength": 1
                }
            },
            "required": [
                "value"
            ]
        },
        "responsibility": {
            "title": "Responsibility",
            "type": "object",
            "properties": {
                "value": {
                    "title": "Value",
                    "type": "string",
                    "minLength": 1
                }
            },
            "required": [
                "value"
            ]
        }
    },
    "required": [
        "editionDesignation"
    ],
    "form": {
        "hide": true,
        "navigation": {
            "essential": true
        },
        "templateOptions": {
            "cssClass": "editor-title"
        }
    }
}

The editor-title CSS class is added twice in the HTML, causing an extra border in the property.

To Reproduce

1. Go to SONAR document's editor https://sonardev.test.rero.ch/manage/records/documents/new.
2. Add the Edition field.
3. A border is surrounding the Edition properties.

Expected behavior
The additional border must not be displayed. In other word, the editor-title class must be added only one time.

Screenshots