show a mismatch for initcap between Spark and DataFusion

```
== Results ==
!== Correct Answer - 7 ==       == Spark Answer - 7 ==
 struct<initcap(name):string>   struct<initcap(name):string>
 [James Smith]                  [James Smith]
 [James Smith]                  [James Smith]
![James Ähtäri]                 [James äHtäRi]
 [Michael Rose]                 [Michael Rose]
 [Rames Rose]                   [Rames Rose]
![Robert Rose-smith]            [Robert Rose-Smith]
 [Robert Williams]              [Robert Williams]
 ```

spark/src/test/scala/org/apache/comet/CometExpressionSuite.scala

@@ -1368,7 +1368,8 @@ class CometExpressionSuite extends CometTestBase with AdaptiveSparkPlanHelper {
           sql(s"create table $table(id int, name varchar(20)) using parquet")
           sql(
             s"insert into $table values(1, 'james smith'), (2, 'michael rose'), " +
-              "(3, 'robert williams'), (4, 'rames rose'), (5, 'james smith')")
+              "(3, 'robert williams'), (4, 'rames rose'), (5, 'james smith'), " +
+              "(6, 'robert rose-smith'), (7, 'james ähtäri')")
           checkSparkAnswerAndOperator(s"SELECT initcap(name) FROM $table")
         }
       }