Include group members in payload.

src/routes/channels/group_add_member.rs

@@ -13,7 +13,8 @@ pub async fn req(user: User, target: Ref, member: Ref) -> Result<()> {
     let channel = target.fetch_channel().await?;
     let perm = permissions::PermissionCalculator::new(&user)
         .with_channel(&channel)
-        .for_channel().await?;
+        .for_channel()
+        .await?;
     if !perm.get_view() {
         Err(Error::LabelMe)?
     }