Fix incorrect test class name

This test class is about the composite item
reader and not the composite item writer.

Author: fmbenhassine

spring-batch-samples/src/test/java/org/springframework/batch/samples/compositereader/CompositeItemWriterSampleFunctionalTests.java renamed to spring-batch-samples/src/test/java/org/springframework/batch/samples/compositereader/CompositeItemReaderSampleFunctionalTests.java

@@ -50,7 +50,7 @@
 import org.springframework.jdbc.support.JdbcTransactionManager;
 import org.springframework.test.jdbc.JdbcTestUtils;
 
-public class CompositeItemWriterSampleFunctionalTests {
+public class CompositeItemReaderSampleFunctionalTests {
 
 	record Person(int id, String name) {
 	}