ArchiSteamFarm: make update scripts indepent from where they are run, cleanups

pkgs/applications/misc/ArchiSteamFarm/update.sh

@@ -15,15 +15,13 @@ if [[ "$new_version" == "$old_version" ]]; then
   fi
 fi
 
-asf_path=$(pwd)
+asf_path=$PWD
 cd ../../../..
 
-nixpkgs_path=$(pwd)
 if [[ "${1:-}" != "--deps-only" ]]; then
     update-source-version ArchiSteamFarm "$new_version"
 fi
 
 $(nix-build -A ArchiSteamFarm.fetch-deps --no-out-link) "$deps_file"
 
-cd "$asf_path"
-./web-ui/update.sh
+exec "$asf_path/web-ui/update.sh"

pkgs/applications/misc/ArchiSteamFarm/web-ui/update.sh

@@ -2,6 +2,7 @@
 #! nix-shell -I nixpkgs=../../../../.. -i bash -p nodePackages.node2nix gnused jq curl
 set -eoux pipefail
 
+cd "$(dirname "$0")"
 pushd ../../../../..
 version=$(nix-instantiate --strict --eval -A ArchiSteamFarm.version | jq -r)
 popd