sched/tls: fix thread ID initialization in tls_dup_info

Set the thread ID (tl_tid) to the destination task's pid during TLS
duplication in fork operations. This ensures the duplicated TLS info
correctly reflects the forked task's thread identifier.

Signed-off-by: hujun5 <hujun5@xiaomi.com>

sched/tls/tls_dupinfo.c

@@ -77,5 +77,9 @@ int tls_dup_info(FAR struct tcb_s *dst, FAR struct tcb_s *src)
 
   info->tl_argv = NULL;
 
+  /* Thread ID */
+
+  info->tl_tid = dst->pid;
+
   return OK;
 }