Correct re-register of filebeat_module_folder

[MoteHue]

The variable filebeat_module_folder was re-registered as its stat output, leading to an incorrect filepath being used later on.

[wazuh-host ~]$ ls
'{'\''changed'\'': False, '\''stat'\'': {'\''exists'\'': False}, '\''failed'\'': False}'

To illustrate, I added some debug outputs:

- name: Debug 1
  debug:
    msg: "{{ filebeat_module_folder }}"
- name: Checking if Filebeat Module folder file exists
  stat:
    path: "{{ filebeat_module_folder }}"
  register: filebeat_module_folder
- name: Debug 2
  debug:
    msg: "{{ filebeat_module_folder }}"

TASK [<ommitted>/ansible/roles/wazuh-ansible/wazuh-ansible/roles/wazuh/ansible-filebeat-oss : Debug 1] *****************************************************************************************
Thursday 12 October 2023  10:48:46 +0000 (0:00:00.067)       0:01:28.481 ******                                                                                                                                                                
ok: [ommitted] =>                                                                                                
  msg: /usr/share/filebeat/module/wazuh

TASK [<ommitted>/ansible/roles/wazuh-ansible/wazuh-ansible/roles/wazuh/ansible-filebeat-oss : Checking if Filebeat Module folder file exists] **************************************************
Thursday 12 October 2023  10:48:46 +0000 (0:00:00.073)       0:01:28.554 ****** 
ok: [ommitted]

TASK [<ommitted>/ansible/roles/wazuh-ansible/wazuh-ansible/roles/wazuh/ansible-filebeat-oss : Debug 2] *****************************************************************************************
Thursday 12 October 2023  10:48:47 +0000 (0:00:00.343)       0:01:28.898 ****** 
ok: [ommitted] => 
  msg:
    changed: false                                                                                                                                                                                                                             
    failed: false                                                                                                      
    stat:                 
      exists: false