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: e6ed54e8 ("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>