directory seek test: code does not agree with comment. Fix code.

the directory was opened with the seek right, and this test says that it
was asserting that the seek right was present. However, the test was
actually asserting that the seek right was *not* present.

This fixes the code of the test, because I believe the comment is
correct.

crates/test-programs/wasi-tests/src/bin/directory_seek.rs

@@ -33,7 +33,7 @@ unsafe fn test_directory_seek(dir_fd: wasi::Fd) {
     );
     assert_eq!(
         (fdstat.fs_rights_base & wasi::RIGHTS_FD_SEEK),
-        0,
+        wasi::RIGHTS_FD_SEEK,
         "directory has the seek right",
     );