[SPARK-52551][SQL][FOLLOW-UP] Enable ANSI mode in PushablePredicateSuite

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

This is a followup of apache#51247 to fix tests in the non ANSI build

### Why are the changes needed?

fix test

### Does this PR introduce _any_ user-facing change?

no

### How was this patch tested?

N/A

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

no

Closes apache#51330

Closes apache#51329 from cloud-fan/follow.

Authored-by: Wenchen Fan <[email protected]>
Signed-off-by: Hyukjin Kwon <[email protected]>

Author: cloud-fan

sql/core/src/test/scala/org/apache/spark/sql/connector/PushablePredicateSuite.scala

@@ -17,6 +17,7 @@
 
 package org.apache.spark.sql.connector
 
+import org.apache.spark.SparkConf
 import org.apache.spark.sql.QueryTest
 import org.apache.spark.sql.catalyst.expressions.{Cast, Literal}
 import org.apache.spark.sql.connector.expressions.filter.{AlwaysTrue, Predicate => V2Predicate}
@@ -27,6 +28,8 @@ import org.apache.spark.sql.types.BooleanType
 
 class PushablePredicateSuite extends QueryTest with SharedSparkSession {
 
+  override def sparkConf: SparkConf = super.sparkConf.set(SQLConf.ANSI_ENABLED, true)
+
   test("simple boolean expression should always return v2 Predicate") {
     Seq(true, false).foreach { createV2Predicate =>
       Seq(true, false).foreach { noAssert =>