[SPARK-40876][SQL][TESTS][FOLLOW-UP] Remove invalid decimal test case when ANSI mode is on

[HyukjinKwon]

What changes were proposed in this pull request?

This PR is a followup of #44513 that excludes Decimal(5, 4) for 10.34 that cannot be represented with ANSI mode on.

Why are the changes needed?

ANSI build is broken (https://github.com/apache/spark/actions/runs/7455394893/job/20284415710):

org.apache.spark.SparkArithmeticException: [NUMERIC_VALUE_OUT_OF_RANGE] 10.34 cannot be represented as Decimal(5, 4). If necessary set "spark.sql.ansi.enabled" to "false" to bypass this error, and return NULL instead. SQLSTATE: 22003
== DataFrame ==
"cast" was called from
org.apache.spark.sql.execution.datasources.parquet.ParquetTypeWideningSuite.writeParquetFiles(ParquetTypeWideningSuite.scala:113)

	at org.apache.spark.sql.errors.QueryExecutionErrors$.cannotChangeDecimalPrecisionError(QueryExecutionErrors.scala:116)
	at org.apache.spark.sql.errors.QueryExecutionErrors.cannotChangeDecimalPrecisionError(QueryExecutionErrors.scala)
	at org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIteratorForCodegenStage1.processNext(Unknown Source)

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Existing test cases should cover.

Was this patch authored or co-authored using generative AI tooling?

No.

[dongjoon-hyun]

+1, LGTM.