style: Change the key name in autofs_mounts dict

So that we can have same key names for both dicts used in autofs.yml and fstab.yml roles

ansible/roles/nfs_mounts/tasks/autofs.yml

 ---
 - name: Create base directories
   ansible.builtin.file:
-    path: "{{ item.dir }}"
+    path: "{{ item.path }}"
     state: directory
     mode: "{{ item.mode }}"
   loop:
-    - { dir: /local, mode: '0777' }
-    - { dir: /share, mode: '0755' }
+    - { path: /local, mode: '0777' }
+    - { path: /share, mode: '0755' }
 
 - name: Create mountpoint dirs
   ansible.builtin.file:
-    path: "{{ item.dir }}"
+    path: "{{ item.path }}"
     state: directory
     mode: "{{ item.mode }}"
   loop: