Bluetooth: MGMT: Fix sparse errors

This fixes the following errors:

net/bluetooth/mgmt.c:5400:59: sparse: sparse: incorrect type in argument 3
(different base types) @@     expected unsigned short [usertype] handle @@
got restricted __le16 [usertype] monitor_handle @@
net/bluetooth/mgmt.c:5400:59: sparse:     expected unsigned short [usertype] handle
net/bluetooth/mgmt.c:5400:59: sparse:     got restricted __le16 [usertype] monitor_handle

Fixes: e6ed54e ("Bluetooth: MGMT: Fix UAF on mgmt_remove_adv_monitor_complete")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202506060347.ux2O1p7L-lkp@intel.com/
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

Author: Vudentz

net/bluetooth/mgmt.c

@@ -5102,11 +5102,11 @@ static void mgmt_adv_monitor_added(struct sock *sk, struct hci_dev *hdev,
 }
 
 static void mgmt_adv_monitor_removed(struct sock *sk, struct hci_dev *hdev,
-				     u16 handle)
+				     __le16 handle)
 {
 	struct mgmt_ev_adv_monitor_removed ev;
 
-	ev.monitor_handle = cpu_to_le16(handle);
+	ev.monitor_handle = handle;
 
 	mgmt_event(MGMT_EV_ADV_MONITOR_REMOVED, hdev, &ev, sizeof(ev), sk);
 }