keep password on retry

static/index.html

@@ -624,7 +624,7 @@
         }
         for (const id of ["ssh-cmd", "ssh-pwd"])
             document.getElementById(id).disabled = false;
-        document.getElementById("ssh-pwd").value = "";
+        // 保留密码, 方便连续操作
     }
 
     function showErr(msg) {