Make sure timeline is refreshed when page is accessed

Change to fetchPolicy: "cache-and-network"

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

js/src/views/Group/Timeline.vue

@@ -110,6 +110,7 @@ type IActivitySkeleton = IActivity | { skeleton: string };
   apollo: {
     group: {
       query: GROUP_TIMELINE,
+      fetchPolicy: "cache-and-network",
       variables() {
         return {
           preferredUsername: this.preferredUsername,