Don't check for specific error string in test

Author: DaveRandom

tests/manager/manager-executeCommand_error-003.phpt

@@ -17,5 +17,5 @@ echo throws(function() use($manager, $command) {
 <?php exit(0); ?>
 --EXPECTF--
 OK: Got MongoDB\Driver\Exception\ConnectionTimeoutException
-No suitable servers found (`serverSelectionTryOnce` set): [connection refused calling ismaster on '%s']
+No suitable servers found (`serverSelectionTryOnce` set): %s
 ===DONE===