vivaldi: use coreutils from nixpkgs

On non-nixos systems the startup script uses coreutils commands linked
against a different glibc than exposed via our wrapped program. As a
result the following failure can occur when invoking `rm`, `readlink`,
`timeout`, and other coreutils commands:

```
+ timeout 3s /update-ffmpeg --user
timeout: symbol lookup error: /nix/store/pacbfvpzqz2mksby36awvbcn051zcji3-glibc-2.40-36/lib/libc.so.6: undefined symbol: __tunable_is_initialized, version GLIBC_PRIVATE
```

Repro:

1. Be on ubuntu 22.04[1]
2. `nix build --impure --expr 'with import ./. {config.allowUnfree=true;}; vivaldi.override { proprietaryCodecs = true; enableWidevine=true;}'`
3. `./result/bin/vivaldi`

[1]: I suspect other distros can exhibit the issue, but this is what I've tested on.

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