[SPARK-47148][SQL][FOLLOWUP] Use broadcast hint to make test more stable

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

A followup of apache#45234 to make the test more stable by using broadcast hint.

### Why are the changes needed?

test improvement

### 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#47007 from cloud-fan/follow.

Authored-by: Wenchen Fan <wenchen@databricks.com>
Signed-off-by: yangjie01 <yangjie01@baidu.com>

sql/core/src/test/scala/org/apache/spark/sql/execution/adaptive/AdaptiveQueryExecSuite.scala

@@ -961,7 +961,7 @@ class AdaptiveQueryExecSuite
       spark.range(10).toDF("col1").createTempView("t1")
       spark.range(5).coalesce(2).toDF("col2").createTempView("t2")
       spark.range(15).toDF("col3").filter(Symbol("col3") >= 2).createTempView("t3")
-      sql("SELECT * FROM (SELECT /*+ BROADCAST(t2) */ * FROM t1 " +
+      sql("SELECT /*+ BROADCAST(t3) */ * FROM (SELECT /*+ BROADCAST(t2) */ * FROM t1 " +
         "INNER JOIN t2 ON t1.col1 = t2.col2) t JOIN t3 ON t.col1 = t3.col3;")
     }
     withTempView("t1", "t2", "t3") {