Fix typo in parameters array

tasks/app.yml

@@ -4,5 +4,5 @@
   register: yunohost_app_installed
 
 - name: Install app
-  shell: yunohost app install {{ app.link }} --args {% for key, value in app.args.items() %}{{key}}={{value}}{% if not loop.last %}\&{% endif %}{% endfor %} >> ~/log.txt
+  shell: yunohost app install {{ app.link }} --args "{% for key, value in app.args.items() %}{{key}}={{value}}{% if not loop.last %}&{% endif %}{% endfor %}"
   when: yunohost_app_installed.stat.exists == False