Fix parsing error when swallowing is active

[exit91]

This PR contains a fix for the following bug: When retrieving the active window, parsing fails with

SerdeError(
    Error("data did not match any variant of untagged enum Aux", line: 0, column: 0),
)

Here is an example of the data that triggers this error:

{
    "address": "0x898d4ec0",
    "mapped": true,
    "hidden": false,
    "at": [13, 13],
    "size": [939, 497],
    "workspace": {
        "id": 1,
        "name": "1"
    },
    "floating": false,
    "monitor": 0,
    "class": "org.gnome.SoundRecorder",
    "title": "Tonaufzeichner",
    "initialClass": "org.gnome.SoundRecorder",
    "initialTitle": "Tonaufzeichner",
    "pid": 328198,
    "xwayland": false,
    "pinned": false,
    "fullscreen": false,
    "fullscreenMode": 0,
    "fakeFullscreen": false,
    "grouped": [],
    "swallowing": "0x898b4540"
}

Given that the field swallowing does not contain a Client object but an address, my best guess is that the field pub swallowing: Option<Box<Self>> should be changed to pub swallowing: Option<Box<Address>>.

[yavko]

thanks so much, I looked at hyprland source code, and assumed it was an owned value, and not a pointer lol