AccountIT#accountIdApi: Get account API with id rather than name

On later branches, getting the account API with anything other than
the id fails.

Change-Id: If02dcf0f9268994b74d50256992ede8460d6c5e9
diff --git a/javatests/com/google/gerrit/acceptance/api/accounts/AccountIT.java b/javatests/com/google/gerrit/acceptance/api/accounts/AccountIT.java
index 046365f..23fc1c0 100644
--- a/javatests/com/google/gerrit/acceptance/api/accounts/AccountIT.java
+++ b/javatests/com/google/gerrit/acceptance/api/accounts/AccountIT.java
@@ -3418,7 +3418,7 @@
   }
 
   private AccountApi accountIdApi() throws RestApiException {
-    return gApi.accounts().id("user");
+    return gApi.accounts().id(user.id.get());
   }
 
   private Set<String> getCookiesNames() {