fix for test pattern list

src/test/java/org/apache/commons/io/FileUtilsListFilesTest.java

@@ -271,7 +271,7 @@ public void testListFilesWithDeletionThreaded() throws ExecutionException, Inter
             int max = 0;
             try {
                 while (System.currentTimeMillis() < endTime) {
-                    final Collection<File> files = FileUtils.listFiles(tempDir, new String[] { "\\.deletetester" }, false);
+                    final Collection<File> files = FileUtils.listFiles(tempDir, new String[] { ".deletetester" }, false);
                     assertNotNull(files);
                     max = Math.max(max, files.size());
                 }