Remove as-of date from argument list for extra create flow logic

Lai points out that, for creation, the as-of date should always be equal to the creation time. And, in fact, there was a check to throw an exception if that is not the case. So it's more straightforward just to remove that argument entirely.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=138783711

java/google/registry/flows/domain/RegistryExtraFlowLogic.java

@@ -89,7 +89,6 @@ public interface RegistryExtraFlowLogic {
   public void performAdditionalDomainCreateLogic(
       DomainResource domain,
       String clientId,
-      DateTime asOfDate,
       int years,
       EppInput eppInput,
       HistoryEntry historyEntry) throws EppException;