Params with default constant marked as required

[Antreesy]

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Steps to reproduce

1. Define arguments as optional
2. Set default value as externally defined constant and not primitive (string, int)
3. Run composer to generate JSON

Expected behaviour

Idea from @nickvergessen : if parser can not resolve the variable, it still should exclude the argument from the list of required args

Actual behaviour

See example in Talk: RoomController#createRoom

int $readOnly = Room::READ_WRITE,
int $listable = Room::LISTABLE_NONE,
int $messageExpiration = 0,

https://github.com/nextcloud/spreed/blob/5d31d3725614523d34276c4bbac830540a3c34c0/lib/Controller/RoomController.php#L646-L648

All of them accept integers, but only messageExpiration is given a 0 default

"schema": {
    "type": "object",
    "required": [
        "roomType",
        "readOnly",
        "listable",
        "lobbyState",
        "sipEnabled",
        "permissions",
        "recordingConsent",
        "mentionPermissions"
    ],

https://github.com/nextcloud/spreed/blob/5d31d3725614523d34276c4bbac830540a3c34c0/openapi.json#L14857-L14866

readOnly and listable are required, messageExpiration is not

"readOnly": {
    "type": "integer",
    "format": "int64",
    "enum": [
        0,
        1
    ],
    "description": "Read only..."
},
"listable": {
    "type": "integer",
    "format": "int64",
    "enum": [
        0,
        1,
        2
    ],
    "description": "Scope where ..."
},
"messageExpiration": {
    "type": "integer",
    "format": "int64",
    "default": 0,
    "description": "Seconds after ...",
    "minimum": 0
},

https://github.com/nextcloud/spreed/blob/5d31d3725614523d34276c4bbac830540a3c34c0/openapi.json#L14905-L14930

only messageExpiration have default value