fix: TaskStatus in kernel is different from TaskStatus in user mode. This will cause [ch3_taskinfo.rs] to fail

Author: zhaiqiming

os4-ref/src/task/task.rs

@@ -58,6 +58,7 @@ impl TaskControlBlock {
 #[derive(Copy, Clone, PartialEq)]
 /// task status: UnInit, Ready, Running, Exited
 pub enum TaskStatus {
+    UnInit,
     Ready,
     Running,
     Exited,