[SPARK-16021][TEST-MAVEN] Fix the maven build

## What changes were proposed in this pull request?

Fixed the maven build for #13983

## How was this patch tested?

The existing tests.

Author: Shixiong Zhu <shixiong@databricks.com>

Closes #14084 from zsxwing/fix-maven.

pom.xml

@@ -1995,6 +1995,7 @@
               <spark.ui.enabled>false</spark.ui.enabled>
               <spark.ui.showConsoleProgress>false</spark.ui.showConsoleProgress>
               <spark.unsafe.exceptionOnMemoryLeak>true</spark.unsafe.exceptionOnMemoryLeak>
+              <spark.memory.debugFill>true</spark.memory.debugFill>
               <!-- Needed by sql/hive tests. -->
               <test.src.tables>src</test.src.tables>
             </systemProperties>