Fixed test - the expected result was wrong

Author: derickr

ext/date/tests/bug80998.phpt

@@ -11,4 +11,4 @@ $string = $date->format('Y-m-d H:i:s.u');
 echo $string, "\n";
 ?>
 --EXPECT--
-2021-04-05 11:00:01.000001
+2021-04-05 11:00:00.000001