Make the superuser flag bypass TLD access checks

The --superuser command in the nomulus command-line tool should be
bypassing checks on whether the passed-in registrar client ID has access
to the TLD in question, but currently it is not.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=158974462

javatests/google/registry/flows/domain/DomainApplicationCreateFlowTest.java

@@ -1131,6 +1131,17 @@ public class DomainApplicationCreateFlowTest
     runSuperuserFlow("domain_create_sunrush_response.xml");
   }
 
+  @Test
+  public void testSuccess_superuserNotAuthorizedForTld() throws Exception {
+    DatastoreHelper.persistResource(Registrar.loadByClientId("TheRegistrar")
+        .asBuilder()
+        .setAllowedTlds(ImmutableSet.<String>of())
+        .build());
+    persistContactsAndHosts();
+    clock.advanceOneMilli();
+    runSuperuserFlow("domain_create_sunrise_encoded_signed_mark_response.xml");
+  }
+
   @Test
   public void testSuccess_superuserSunrush() throws Exception {
     createTld("tld", TldState.SUNRUSH);