Fix current-task check in mo_task_suspend()

The previous implementation compared kcb->task_current directly with
the task's list node, which became incorrect after introducing the
embedded ready-queue list-node structure. This commit updates the
condition to compare the underlying task object instead:

    kcb->task_current->data == task

This ensures mo_task_suspend() correctly detects when the suspended
task is the currently running one.

Author: vicLin8712

kernel/task.c

@@ -784,7 +784,7 @@ int32_t mo_task_suspend(uint16_t id)
         sched_dequeue_task(task);
 
     task->state = TASK_SUSPENDED;
-    bool is_current = (kcb->task_current == node);
+    bool is_current = (kcb->task_current->data == task);
 
     CRITICAL_LEAVE();