pg_upgrade: Fix test name in 002_pg_upgrade.pl

Author: Hou Zhijie
Discussion: https://postgr.es/m/TYAPR01MB5724A40D47E71F4717357EC694D5A@TYAPR01MB5724.jpnprd01.prod.outlook.com
Backpatch-through: 15

Author: michaelpq

src/bin/pg_upgrade/t/002_pg_upgrade.pl

@@ -382,7 +382,7 @@ sub filter_dump
 	],
 	'run of pg_upgrade --check for new instance');
 ok(!-d $newnode->data_dir . "/pg_upgrade_output.d",
-	"pg_upgrade_output.d/ not removed after pg_upgrade --check success");
+	"pg_upgrade_output.d/ removed after pg_upgrade --check success");
 
 # Actual run, pg_upgrade_output.d is removed at the end.
 command_ok(