Remove redundant self-type from SQLTestUtilsBase

QueryTestBase already declares self: Suite, so SQLTestUtilsBase
inherits the constraint.

Co-authored-by: Isaac

Author: zhengruifeng

sql/core/src/test/scala/org/apache/spark/sql/test/SQLTestUtils.scala

@@ -17,16 +17,14 @@
 
 package org.apache.spark.sql.test
 
-import org.scalatest.Suite
-
 import org.apache.spark.sql.{QueryTest, QueryTestBase, Row}
 
 /**
  * Helper trait that can be extended by all external SQL test suites.
  *
  * This is now an alias for [[QueryTestBase]].
  */
-private[sql] trait SQLTestUtilsBase extends QueryTestBase { self: Suite => }
+private[sql] trait SQLTestUtilsBase extends QueryTestBase
 
 /**
  * Helper trait that should be extended by all SQL test suites within the Spark