refactor: clean up scripts

Tidy up the script logic and deduplicate it a bit.

scripts/audiomenu/package.nix

@@ -1,4 +1,8 @@
-{ lib, rustPlatform, cleanRustSrc }:
+{
+  lib,
+  rustPlatform,
+  cleanRustSrc,
+}:
 let
   cargoToml = builtins.fromTOML (builtins.readFile ./Cargo.toml);
   inherit (cargoToml.package) name version description;

scripts/jpassmenu/package.nix

@@ -1,4 +1,8 @@
-{ lib, rustPlatform, cleanRustSrc }:
+{
+  lib,
+  rustPlatform,
+  cleanRustSrc,
+}:
 let
   cargoToml = builtins.fromTOML (builtins.readFile ./Cargo.toml);
   inherit (cargoToml.package) name version description;