activity: add user current location as default for a new activity

src/Bundle/ChillActivityBundle/Resources/views/Activity/newAccompanyingCourse.html.twig

@@ -22,6 +22,7 @@
             '{{ "You are going to leave a page with unsubmitted data. Are you sure you want to leave ?"|trans }}');
         });
         window.activity = {{ activity_json|json_encode|raw }};
+        window.default_location_id = {{ default_location_id }};
     </script>
     {{ encore_entry_script_tags('vue_activity') }}
 {% endblock %}