[SPARK-29571][SQL][TESTS][FOLLOWUP] Fix UT in AllExecutionsPageSuite

### What changes were proposed in this pull request?

This is a follow-up of #24052 to correct assert condition.

### Why are the changes needed?
 To test IllegalArgumentException condition..

### Does this PR introduce any user-facing change?
 No.

### How was this patch tested?

Manual Test (during fixing of SPARK-29453 find this issue)

Closes #26234 from 07ARB/SPARK-29571.

Authored-by: 07ARB <ankitrajboudh@gmail.com>
Signed-off-by: HyukjinKwon <gurwls223@apache.org>

sql/core/src/test/scala/org/apache/spark/sql/execution/ui/AllExecutionsPageSuite.scala

@@ -73,7 +73,7 @@ class AllExecutionsPageSuite extends SharedSparkSession with BeforeAndAfter {
     map.put("failed.sort", Array("duration"))
     when(request.getParameterMap()).thenReturn(map)
     val html = renderSQLPage(request, tab, statusStore).toString().toLowerCase(Locale.ROOT)
-    assert(!html.contains("IllegalArgumentException"))
+    assert(!html.contains("illegalargumentexception"))
     assert(html.contains("duration"))
   }