add IncludeDj to directory_page

[Nazar1ky]

Issue from: #526 (comment)

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Added new variable includeIsDJ, without it server return response:

{'errors': [{'message': 'Variable "includeIsDJ" has invalid value null.\nExpected type "Boolean!", found null.', 'locations': [{'line': 1, 'column': 154}]}], 'extensions': {'durationMilliseconds': 2, 'operationName': 'DirectoryPage_Game', 'requestID': '01J4Q51NTKF0Y71G3CC'}}

That variable adds isParticipatingDJ:

    {
        "cursor": "eyJzIjoxMzY1LjM4MjQ1NjU1OTU0NDIsImQiOmZhbHNlLCJ0Ijp0cnVlfQ==",
        "node": {
            "id": "42708821592",
            "title": "Der Weg zum Set Bonus",
            "viewersCount": 1365,
            "previewImageURL": "https://static-cdn.jtvnw.net/previews-ttv/live_user_keysjore-440x248.jpg",
            "broadcaster": {
                "id": "28552242",
                "login": "keysjore",
                "displayName": "KeysJore",
                "roles": {
                    "isPartner": true,
+                   "isParticipatingDJ": false,
                    "__typename": "UserRoles"
                },
                "profileImageURL": "https://static-cdn.jtvnw.net/jtv_user_pictures/keysjore-profile_image-5cf0ec46d8075838-50x50.jpeg",
                "primaryColorHex": null,
                "__typename": "User"
            },
            "freeformTags": [
                {
                    ...
                },
                {
                    ...
                }
            ],
            "type": "live",
            "game": {
                ...
            },
            "previewThumbnailProperties": {
               ...
            },
            "__typename": "Stream"
        },
        "trackingID": null,
        "__typename": "StreamEdge"
    },

That used for: