ryujinx: fix updater script hash format + some shellcheck warnings

#! /usr/bin/env nix-shell

#! nix-shell -I nixpkgs=./. -i bash -p coreutils gnused curl common-updater-scripts nix-prefetch-git jq

# shellcheck shell=bash

set -euo pipefail

cd "$(dirname "${BASH_SOURCE[0]}")"

if [[ "${1-default}" != "--deps-only" ]]; then

    SHA="$(nix-prefetch-git https://github.com/ryujinx/ryujinx --rev "$COMMIT" --quiet | jq -r '.sha256')"

    update-source-version ryujinx "$NEW_VERSION" "$SHA" --rev="$COMMIT"

    SRI=$(nix --experimental-features nix-command hash to-sri "sha256:$SHA")

    update-source-version ryujinx "$NEW_VERSION" "$SRI" --rev="$COMMIT"

fi

echo "building Nuget lockfile"

$(nix-build -A ryujinx.fetch-deps --no-out-link)

eval "$(nix-build -A ryujinx.fetch-deps --no-out-link)"