Close handle via fd to prevent orphaned fd (#1623)

Signed-off-by: Alan Jowett <alanjo@microsoft.com>

Signed-off-by: Alan Jowett <alanjo@microsoft.com>
Co-authored-by: Dave Thaler <dthaler@microsoft.com>

libs/api/ebpf_api.cpp

@@ -1052,8 +1052,8 @@ _clean_up_ebpf_link(_In_opt_ _Post_invalid_ ebpf_link_t* link) noexcept
     if (link == nullptr) {
         EBPF_RETURN_VOID();
     }
-    if (link->handle != ebpf_handle_invalid) {
-        ebpf_api_close_handle(link->handle);
+    if (link->fd != ebpf_fd_invalid) {
+        Platform::_close(link->fd);
     }
     free(link->pin_path);