Fix usage of `assertThat` in AccountIT

Change-Id: I6e09373d7fa2eec56b891a21296bc131b88faa6c
diff --git a/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/api/accounts/AccountIT.java b/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/api/accounts/AccountIT.java
index 88fb422..7dffd5d 100644
--- a/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/api/accounts/AccountIT.java
+++ b/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/api/accounts/AccountIT.java
@@ -68,7 +68,7 @@
     List<AccountInfo> result = gApi.accounts()
         .suggestAccounts().withQuery(adminUsername).get();
     assertThat(result.size()).is(1);
-    assertThat(result.get(0).username.equals(adminUsername));
+    assertThat(result.get(0).username).isEqualTo(adminUsername);
 
     List<AccountInfo> resultShortcutApi = gApi.accounts()
         .suggestAccounts(adminUsername).get();