Tests: Remove redundant placeholder function

It's the only error flagged by a non-inclusive terminology checker.

Author: GaryJones

WordPress/Tests/DB/DirectDatabaseQueryUnitTest.inc

@@ -16,8 +16,8 @@ function bar() {
 	return $listofthings;
 }
 
-function dummy() {
-}
+
+
 
 function baz() {
 	global $wpdb;