nix-interop: fix option completion of `types.attrsOf (types.submodule…

… {})`

a.k.a. fix a small typo.

Because the type-name `attrsOf` was never matched, e.g.
`systemd.services` always had type `any`.

crates/nix-interop/src/nixos_options.nix

@@ -104,8 +104,8 @@ let
 
       listOf = { name = "list"; inherit elem; };
 
-      attrOf = { name = "attrset"; rest = elem; };
-      lazyAttrOf = { name = "attrset"; rest = elem; };
+      attrsOf = { name = "attrset"; rest = elem; };
+      lazyAttrsOf = { name = "attrset"; rest = elem; };
 
       uniq = elem;
       unique = elem;

dev/flake.nix

@@ -0,0 +1,8 @@
+{
+  description = "foo";
+  outputs = { self, nixpkgs, ... }: {
+    nixosModules.default = { lib, ... }: {
+
+    };
+  };
+}

dev/test.nix

@@ -0,0 +1,10 @@
+{ lib, ... }: {
+  config = {
+
+  };
+  imports = [
+    {
+
+    }
+  ];
+}