getKet function return ket file without selection flags

[AlexeyGirin]

Description
getKet function return ket file without selection flags

Steps to Reproduce

1. Try to get ket file using getKet function for simple atom (H2)

Actual behavior

{
    "root": {
        "nodes": [
            {
                "$ref": "mol0"
            }
        ],
        "connections": [],
        "templates": []
    },
    "mol0": {
        "type": "molecule",
        "atoms": [
            {
                "label": "H",
                "location": [
                    18.1,
                    -6.1000000000000005,
                    0
                ]
            }
        ]
    }
}

Expected behavior

{
    "root": {
        "nodes": [
            {
                "$ref": "mol0"
            }
        ],
        "connections": [],
        "templates": []
    },
    "mol0": {
        "type": "molecule",
        "atoms": [
            {
                "label": "H",
                "location": [
                    18.1,
                    -6.1000000000000005,
                    0
                ],
                "selected": true
            }
        ]
    }
}

Environment details (please complete the following information):

• Ketcher Version 2.19.0-rc.2 Build at 2024-03-12; 08:05:28
• Indigo Version 1.19.0-dev.1.0-g9fa8cfe30-wasm32-wasm-clang-12.0.0
• Chrome Version Version 122.0.6261.112 (Official Build) (64-bit)
• Win10
• Issue found while testing Support selection entity selection flag in KET format #3934

[Zhirnoff]

Test added to the automation table.

[AlexeyGirin]

Fixed.
Ketcher Version 2.21.0-rc.1 Build at 2024-04-15; 20:00:15
Indigo Toolkit Version 1.20.0-rc.1.0-g8e8ffc3c3-wasm32-wasm-clang-12.0.0

{
    "root": {
        "nodes": [
            {
                "$ref": "mol0"
            }
        ],
        "connections": [],
        "templates": []
    },
    "mol0": {
        "type": "molecule",
        "atoms": [
            {
                "label": "H",
                "location": [
                    20.40885119736195,
                    -9.76364661693573,
                    0
                ],
                "selected": true
            }
        ],
        "stereoFlagPosition": {
            "x": 20.40885119736195,
            "y": 8.76364661693573,
            "z": 0
        }
    }
}