fix unit test

Author: beryllw

flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/mysql/source/MySqlSourceITCase.java

@@ -955,7 +955,7 @@ private void testMySqlParallelSource(
                                 + " 'scan.incremental.snapshot.chunk.size' = '100',"
                                 + " 'scan.incremental.snapshot.backfill.skip' = '%s',"
                                 + " 'server-time-zone' = 'UTC',"
-                                + " 'scan.incremental.snapshot.assign-ending-first.enabled' = '%s',"
+                                + " 'scan.incremental.snapshot.assign-ending-chunk-first.enabled' = '%s',"
                                 + " 'server-id' = '%s'"
                                 + " %s"
                                 + ")",