arr: Fix remaining arrstack_data_dir variable

roles/arr/tasks/main.yml

@@ -10,7 +10,7 @@
 - name: Create Arr stack data directory
   ansible.builtin.file:
     state: directory
-    path: "{{ arrstack_data_dir }}/{{ item }}"
+    path: "{{ arrstack_serve_dir }}/{{ item }}"
     owner: "{{ arrstack_puid }}"
     group: "{{ arrstack_pgid }}"
     mode: 0770