fix test filename

Author: weltling

ext/standard/tests/streams/proc_open_bug51800_right2.phpt

@@ -2,7 +2,7 @@
 Bug #51800 proc_open on Windows hangs forever, the right way to do it with more data
 --FILE--
 <?php
-$callee = dirname(__FILE__) . "/process_proc_open_bug51800_right.php";
+$callee = dirname(__FILE__) . "/process_proc_open_bug51800_right2.php";
 $php = PHP_BINARY;
 $cmd = "$php $callee";
 
@@ -66,7 +66,7 @@ var_dump(array(
 ===DONE===
 --CLEAN--
 <?php
-$callee = dirname(__FILE__) . "/process_proc_open_bug51800_right.php";
+$callee = dirname(__FILE__) . "/process_proc_open_bug51800_right2.php";
 unlink($callee);
 ?>
 --EXPECTF--