webkitgtk: Bind NixOS directories to sandbox last

Since https://github.com/WebKit/WebKit/commit/31ac354cbeecf866f9a38f7b2f8f59f7975d3f6a,
bubblewrap gets called the following way on NixOS system,
when it has `share/fonts` in `environment.pathsToLink`:

    $ bwrap --ro-bind /nix/store /nix/store --ro-bind /run/current-system /run/current-system --ro-bind-try /run/current-system/sw/share/fonts /run/current-system/sw/share/fonts -- $(realpath $(which true))
    bwrap: Can't mkdir parents for /run/current-system/sw/share/fonts: No such file or directory

It fails because `/run/current-system/sw` is a symlink
so bubblewrap is not be able to add another mountpoint inside.

Ideally, we would remove the `/run/current-system/sw` bind mount
and mount only specific subdirectories we need, like the fonts.
Unfortunately, it is not clear what else is needed. For example,
in the past, Pipewire’s Jack module was loaded from `/run/current-system/sw/lib`
https://github.com/NixOS/nixpkgs/commit/756e60344fd83427148d8acf416c63573404a2e9

So, for now, let’s keep the and mount and move the binding of NixOS directories
to the end. Adding bindings starting at leaves and moving to root should be fine.

While at it, let’s also make the binding of `/run/current-system` conditional
since it will not be available outside of NixOS.

Fixes: https://github.com/NixOS/nixpkgs/issues/197085

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