OZG-725 adjust test to be consistent

alfa-service/src/test/java/de/ozgcloud/alfa/historie/ChangeHistoryBuilderTest.java

@@ -262,7 +262,7 @@ public class ChangeHistoryBuilderTest {
 		void shouldReturnEmptyIfPropertyIsNotPresentInBody() {
 			var command = previousCommand.toBuilder().body(Map.of("a", "b")).build();
 
-			var value = builder.getValueFromCommandBody(PROPERTY_NAME, command);
+			var value = builder.getValueFromCommandBody("notExists", command);
 
 			assertThat(value).isEmpty();
 		}