Fix test_acceptors_restarts.

In 746f667 I "optimized" wal_acceptor tests by setting "--pageserver"
flag only on one of wal_acceptors. Which obviously will hang the system if
that wal_acceptors is down. And test_acceptors_restarts does exctly this.

Set "--pageserver" on all wal_acceptors as it was before.

integration_tests/src/lib.rs

@@ -108,7 +108,7 @@ impl TestStorageControlPlane {
                 data_dir: datadir_base.join(format!("wal_acceptor_{}", i)),
                 systemid,
                 env: local_env.clone(),
-                pass_to_pageserver: i == 0,
+                pass_to_pageserver: true,
             };
             wal_acceptor.init();
             wal_acceptor.start();