fileinfo: Fix cleanup in ext/fileinfo/tests/cve-2014-1943-mb.phpt (#18397)

This also removes an accidentally committed file.

Author: TimWolla

ext/fileinfo/tests/cve-2014-1943-mb.phpt

@@ -26,8 +26,8 @@ finfo_close($fi);
 Done
 --CLEAN--
 <?php
-@unlink(__DIR__.'/cve-2014-1943.data');
-@unlink(__DIR__.'/cve-2014-1943.magic');
+@unlink(__DIR__.'/cve-2014-1943私はガラスを食べられます.data');
+@unlink(__DIR__.'/cve-2014-1943私はガラスを食べられます.magic');
 ?>
 --EXPECTF--
 string(%d) "%s"