fix: sway/wlroots version strings

[bandithedoge]

This still needs to be fixed as it can break other packages like river which refuses to build with wlroots <0.15. You can use an overlay as a temporary workaround like so:

nixpkgs = {
    overlays = [
        (self: super: {
            wlroots = super.wlroots.overrideAttrs (_: {
                version = "0.15";
            });
        })
    ];
};