yarn2nix: run `nix-prefetch-git` with `--fetch-submodules`

`pkgs.fetchgit` uses `fetchSubmodules = true;` by default, however
`nix-prefetch-git` doesn't. This means that hashes for a Git repository
with fetched submodules will be wrong in `yarn.nix`.

Considering that this got unnoticed before, it seems as if this case is
an exception to a certain degree.

An exemplary problem is the last `hedgedoc` update[1] where
`js-sequence-diagrams` - a Git repo with submodules - from upstream's
package.json caused a hash mismatch. This got unnoticed because
`nix-build --check` doesn't seem to reveal these issues for fixed-output
derivations.

[1] https://github.com/NixOS/nixpkgs/pull/139238

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