Add missing when statement

roles/matrix-riot-web/tasks/setup_riot_web.yml

@@ -28,6 +28,7 @@
     mode: 0644
     owner: "{{ matrix_user_username }}"
     group: "{{ matrix_user_username }}"
+  when: matrix_riot_web_enabled|bool
 
 - name: Ensure Matrix riot-web config files installed
   template: