HSEARCH-4283 Remove duplicated code line

Not related to the issue, but done in the context of the issue

integrationtest/mapper/orm-coordination-outbox-polling/src/test/java/org/hibernate/search/integrationtest/mapper/orm/coordination/outboxpolling/automaticindexing/OutboxPollingAutomaticIndexingBackendFailureIT.java

@@ -146,7 +146,6 @@ public void backendFailure_retryAfter() {
 		backendMock.verifyExpectationsMet();
 
 		backendMock.expectWorks( IndexedEntity.INDEX )
-				.createAndExecuteFollowingWorks()
 				// retry (succeeds):
 				.createAndExecuteFollowingWorks()
 				.addOrUpdate( "2", b -> b