nfsd_add_export: fix become method for filesystem formatting

The filesystem module was unable to find mkfs.xfs when using
'become_flags: "su - -c"' which changes the environment.
Change to use standard 'become_method: sudo' to preserve
the PATH and allow the module to find the mkfs.xfs executable.

Generated-by: Claude AI
Signed-off-by: Luis Chamberlain <[email protected]>

Author: mcgrof

playbooks/roles/nfsd_add_export/tasks/storage/local.yml

@@ -11,8 +11,7 @@
 
 - name: Format new volume for {{ export_fstype }}
   become: true
-  become_flags: "su - -c"
-  become_method: ansible.builtin.sudo
+  become_method: sudo
   delegate_to: "{{ server_host }}"
   community.general.filesystem:
     fstype: "{{ export_fstype }}"