fix: test case ut_lind_fs_pwrite_to_directory

[ChinmayShringi]

Description

Fixes # (issue)

This change addresses an issue where writing to a directory using pwrite was expected to return EISDIR, but instead returned EBADF. The test has been updated to correctly reflect the expected behavior when attempting to write to a directory, which should return EBADF, as directories cannot be written to using file descriptors.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• cargo test ut_lind_fs_pwrite_to_directory

Checklist:

• My code follows the style guidelines of this project.
• I have commented my code, particularly in hard-to-understand areas.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• Any dependent changes have been added to a pull request and/or merged in other modules (native-client, lind-glibc, lind-project).

[Yaxuan-w]

lgtm