chore: rustfmt fixups for app_members files

Trailing-comma format! cleanup from `cargo fmt --all`.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/manager-core/src/app_members_api.rs

@@ -184,9 +184,7 @@ async fn remove_member(
 ) -> Result<StatusCode, AppMembersApiError> {
     let app = resolve_app(&*s.apps, &id_or_slug).await?;
     require(s.authz.as_ref(), &principal, Capability::AppAdmin(app.id)).await?;
-    s.members
-        .remove(app.id, AdminUserId::from(user_id))
-        .await?;
+    s.members.remove(app.id, AdminUserId::from(user_id)).await?;
     Ok(StatusCode::NO_CONTENT)
 }