Fix flathub linter issues

[Erick555]

This fixes below errors/warnings:

{
    "errors": [
        "finish-args-broken-kde-tray-permission"
    ],
    "warnings": [
        "finish-args-contains-both-x11-and-wayland"
    ]
}

[flathubbot]

Started test build 3336

[flathubbot]

Build 3336 successful
To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/115773/org.qbittorrent.qBittorrent.flatpakref

[Chocobo1]

#92 (comment)

I'll wait awhile to see the outcome of that ticket.

[Chocobo1]

@Erick555
The discussion at flathub-infra/flatpak-builder-lint#66 doesn't seem to lead anywhere. So I think it is best to merge your PR to avoid stalling this repo. What do you think?

[Erick555]

I agree. It could be reverted when something on flathub changes.

[Chocobo1]

@Erick555
Thank you!