Move config j2 files out of "config" subfolder for consistency

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

roles/custom/matrix-bot-maubot/tasks/setup_install.yml

@@ -20,7 +20,7 @@
 
 - name: Ensure maubot configuration file created
   ansible.builtin.template:
-    src: "{{ role_path }}/templates/config/config.yaml.j2"
+    src: "{{ role_path }}/templates/config.yaml.j2"
     dest: "{{ matrix_bot_maubot_config_path }}/config.yaml"
     owner: "{{ matrix_user_username }}"
     group: "{{ matrix_user_groupname }}"