Revert NioFileLockerTests

**Auto-cherry-pick to `7.0.x` & `6.5.x`**

Author: artembilan

spring-integration-file/src/test/java/org/springframework/integration/file/inbound/WatchServiceDirectoryScannerTests.java

@@ -203,7 +203,7 @@ public boolean remove(File fileToRemove) {
 
 		assertThat(removeFileLatch.await(10, TimeUnit.SECONDS)).isTrue();
 
-		File baz3 = File.createTempFile("baz3", ".txt", baz).getCanonicalFile();
+		File baz3 = File.createTempFile("baz3", ".txt", baz.getCanonicalFile());
 
 		n = 0;
 		Message<File> fileMessage = null;

spring-integration-file/src/test/java/org/springframework/integration/file/locking/NioFileLockerTests.java

@@ -45,7 +45,7 @@ public class NioFileLockerTests {
 	@Test
 	public void fileListedByFirstFilter() throws Exception {
 		NioFileLocker filter = new NioFileLocker();
-		File testFile = new File(workdir, "test0").getCanonicalFile();
+		File testFile = new File(workdir, "test0");
 		testFile.createNewFile();
 		assertThat(filter.filterFiles(workdir.listFiles()).get(0)).isEqualTo(testFile);
 		filter.lock(testFile);